From 4bd55e78c14fb04cc1a5ef3517888c877cebaf6c Mon Sep 17 00:00:00 2001 From: Pierre Ricadat Date: Sat, 18 May 2024 09:43:32 +0000 Subject: [PATCH] [ci skip] update docs --- docs/404.html | 6 +++--- docs/about/index.html | 4 ++-- docs/assets/js/{24.d41ca9d3.js => 24.b4ac11c6.js} | 2 +- docs/assets/js/{37.ebe3c9ba.js => 37.bd0ea2c6.js} | 2 +- docs/assets/js/{38.81bab45a.js => 38.62558a4e.js} | 2 +- docs/assets/js/{app.cd64229a.js => app.ad6f5196.js} | 4 ++-- docs/docs/adapters.html | 4 ++-- docs/docs/client-codegen.html | 4 ++-- docs/docs/client.html | 4 ++-- docs/docs/examples.html | 4 ++-- docs/docs/federation.html | 4 ++-- docs/docs/index.html | 12 ++++++------ docs/docs/interop.html | 4 ++-- docs/docs/laminext.html | 4 ++-- docs/docs/middleware.html | 4 ++-- docs/docs/optimization.html | 4 ++-- docs/docs/relay-connections.html | 4 ++-- docs/docs/schema-comparison.html | 4 ++-- docs/docs/schema-reporting.html | 4 ++-- docs/docs/schema.html | 8 ++++---- docs/docs/server-codegen.html | 4 ++-- docs/docs/stitching.html | 4 ++-- docs/docs/tools.html | 4 ++-- docs/faq/index.html | 4 ++-- docs/index.html | 4 ++-- docs/resources/index.html | 4 ++-- 26 files changed, 56 insertions(+), 56 deletions(-) rename docs/assets/js/{24.d41ca9d3.js => 24.b4ac11c6.js} (99%) rename docs/assets/js/{37.ebe3c9ba.js => 37.bd0ea2c6.js} (80%) rename docs/assets/js/{38.81bab45a.js => 38.62558a4e.js} (99%) rename docs/assets/js/{app.cd64229a.js => app.ad6f5196.js} (93%) diff --git a/docs/404.html b/docs/404.html index 5187f31d8..43d3c750b 100644 --- a/docs/404.html +++ b/docs/404.html @@ -8,13 +8,13 @@ - + -

404

That's a Four-Oh-Four.
+ - + diff --git a/docs/about/index.html b/docs/about/index.html index fde29b0ce..9237feb9d 100644 --- a/docs/about/index.html +++ b/docs/about/index.html @@ -8,7 +8,7 @@ - + @@ -37,6 +37,6 @@ (opens new window)
Scaladoc (opens new window)

# About

Caliban is a project created by Pierre Ricadat aka @ghostdogpr (opens new window).

Current maintainers:

The name is inspired by the SF novel and tv series The Expanse (opens new window).

Thanks:

- + diff --git a/docs/assets/js/24.d41ca9d3.js b/docs/assets/js/24.b4ac11c6.js similarity index 99% rename from docs/assets/js/24.d41ca9d3.js rename to docs/assets/js/24.b4ac11c6.js index 0cd0d42e5..12e134b7e 100644 --- a/docs/assets/js/24.d41ca9d3.js +++ b/docs/assets/js/24.b4ac11c6.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[24],{305:function(t,a,s){"use strict";s.r(a);var e=s(14),r=Object(e.a)({},(function(){var t=this,a=t._self._c;return a("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[a("h1",{attrs:{id:"getting-started"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#getting-started"}},[t._v("#")]),t._v(" Getting Started")]),t._v(" "),a("p",[a("strong",[t._v("Caliban")]),t._v(" is a purely functional library for creating GraphQL servers and clients in Scala.")]),t._v(" "),a("p",[t._v("For more details on Caliban Client, see the "),a("RouterLink",{attrs:{to:"/docs/client.html"}},[t._v("dedicated section")]),t._v(". 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operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),t._v("\n")])])]),a("p",[t._v("Let's create a case class named "),a("code",[t._v("Queries")]),t._v(" that will represent our API, with 2 fields named and modeled after the functions we want to expose.\nWe then create a value of this class that calls our actual functions. This is our resolver.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// schema")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" CharacterName"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("name"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("characters"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n character"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" CharacterName "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" Option"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// resolver")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" queries "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("getCharacters"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" args "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" getCharacter"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("args"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("name"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("The next step is creating our GraphQL API definition.")]),t._v(" "),a("p",[t._v("First, we wrap our query resolver inside a "),a("code",[t._v("RootResolver")]),t._v(", the root object that contains queries, mutations and subscriptions. Only queries are mandatory.\nThen we call the "),a("code",[t._v("graphQL")]),t._v(" function which will turn our simple resolver value into a GraphQL API definition.\nThe whole schema will be derived at compile time, meaning that if it compiles, it will be able to serve it.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema"),a("span",{pre:!0,attrs:{class:"token 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("),a("code",[t._v("api.interpreter")]),t._v(") and start processing requests ("),a("code",[t._v("interpreter.execute")]),t._v(").\nThe interpreter is not tied any web framework, so you are free to expose this function using the protocol and library of your choice.")]),t._v(" "),a("p",[t._v("The easiest (and most performant!) way to expose your API over HTTP is to use the optional "),a("code",[t._v("caliban-quick")]),t._v(" module based on "),a("a",{attrs:{href:"https://github.com/zio/zio-http",target:"_blank",rel:"noopener noreferrer"}},[t._v("zio-http"),a("OutboundLink")],1),t._v(".")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"com.github.ghostdogpr"')]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token 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specific server requirements or need to interop with other libraries, Caliban offers a wide range of modules to help you do that.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"com.github.ghostdogpr"')]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"caliban-http4s"')]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"2.6.0"')]),t._v(" "),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// routes for http4s")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"com.github.ghostdogpr"')]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),a("span",{pre:!0,attrs:{class:"token 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"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// interop with cats-effect")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"com.github.ghostdogpr"')]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"caliban-monix"')]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"2.6.0"')]),t._v(" "),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// interop with monix")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"com.github.ghostdogpr"')]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"caliban-tapir"')]),t._v(" "),a("span",{pre:!0,attrs:{class:"token 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"),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Pilot")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("callSign")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("If you prefer an "),a("code",[t._v("Interface")]),t._v(" instead of a "),a("code",[t._v("Union")]),t._v(" type, add the "),a("code",[t._v("@GQLInterface")]),t._v(" annotation to your sealed trait.\nAn interface will be created with all the fields that are common to the case classes extending the sealed trait, as long as they return the same type.")]),t._v(" "),a("p",[t._v("If you prefer to have a "),a("code",[t._v("Union")]),t._v(" type instead of an "),a("code",[t._v("Enum")]),t._v(", even when the sealed trait contains only objects, add the "),a("code",[t._v("@GQLUnion")]),t._v(" annotation.")]),t._v(" "),a("h2",{attrs:{id:"case-classes-and-sealed-traits"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#case-classes-and-sealed-traits"}},[t._v("#")]),t._v(" Case classes and sealed traits")]),t._v(" "),a("p",[t._v("The transformation between Scala types and GraphQL types is handled by a typeclass named "),a("code",[t._v("Schema")]),t._v(". As mentioned earlier, Caliban provides instances of "),a("code",[t._v("Schema")]),t._v(" for all basic Scala types, but inevitably you will need to support your own types, in particular case classes and sealed traits.")]),t._v(" "),a("p",[t._v("Caliban is able to generate instances of "),a("code",[t._v("Schema")]),t._v(" for case classes and sealed traits. You have two choices for doing that: auto derivation and semi-auto derivation.")]),t._v(" "),a("h3",{attrs:{id:"auto-derivation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#auto-derivation"}},[t._v("#")]),t._v(" Auto derivation")]),t._v(" "),a("p",[t._v("Auto derivation is achieved easily by adding the following import:")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("_\n")])])]),a("p",[t._v("Using this import, Caliban will generate "),a("code",[t._v("Schema")]),t._v(" instances for all the case classes and sealed traits that are found inside your resolver.")]),t._v(" "),a("div",{staticClass:"custom-block warning"},[a("p",{staticClass:"custom-block-title"},[t._v("Limitations")]),t._v(" "),a("p",[t._v("Auto derivation is the easiest way to get started, but it has some drawbacks:")]),t._v(" "),a("ul",[a("li",[t._v("If a type is referenced in several places inside your resolver, a "),a("code",[t._v("Schema")]),t._v(" will be generated for each occurrence, which can lead to longer compilation times and a high amount of generated code (a sign of this is that the compiler will suggest increasing "),a("code",[t._v("-Xmax-inlines")]),t._v(" in Scala 3).")]),t._v(" "),a("li",[t._v("When a "),a("code",[t._v("Schema")]),t._v(" is missing for a nested type inside your resolver, it can sometimes be difficult to find out which type is missing when using auto derivation, because the error message will mention the root type and not the nested one.")]),t._v(" "),a("li",[t._v("The macro that generates the "),a("code",[t._v("Schema")]),t._v(" instances sometimes gets confused when there are a lot of nested or recursive types, and can mistakenly generate a "),a("code",[t._v("Schema")]),t._v(" for types that already have a "),a("code",[t._v("Schema")]),t._v(" in scope. For this reason, semi-auto derivation is recommended for non-trivial schemas.")])])]),t._v(" "),a("h3",{attrs:{id:"semi-auto-derivation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#semi-auto-derivation"}},[t._v("#")]),t._v(" Semi-auto derivation")]),t._v(" "),a("p",[t._v("Semi-auto derivation is achieved as follows for each type that needs a "),a("code",[t._v("Schema")]),t._v(" instance ("),a("code",[t._v("MyClass")]),t._v(" in the example):")]),t._v(" "),a("code-group",[a("code-block",{attrs:{title:"Scala 2",active:""}},[a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" MyClass"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("field"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" schemaForMyClass"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" MyClass"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("gen\n")])])])]),t._v(" "),a("code-block",{attrs:{title:"Scala 3"}},[a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" MyClass"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("field"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("derives")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("SemiAuto\n\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// if you don't want to use the `derives` syntax, you can also use the following:")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("given")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" MyClass"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("gen\n")])])])])],1),t._v(" "),a("p",[t._v("In Scala 3, derivation doesn't support value classes and opaque types. You can use "),a("code",[t._v("Schema.genDebug")]),t._v(" to print the generated code in the console.")]),t._v(" "),a("h3",{attrs:{id:"combining-auto-and-semi-auto-derivation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#combining-auto-and-semi-auto-derivation"}},[t._v("#")]),t._v(" Combining auto and semi-auto derivation")]),t._v(" "),a("p",[t._v("For some types such as enums, it might be desirable to use auto derivation to reduce boilerplate schema definitions:")]),t._v(" "),a("code-group",[a("code-block",{attrs:{title:"Scala 2",active:""}},[a("div",{staticClass:"language-scala mdoc:silent:reset extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v(".")]),t._v("auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("_\n Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("gen\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])])]),t._v(" "),a("code-block",{attrs:{title:"Scala 3 (Any schema)"}},[a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("enum")]),t._v(" Origin "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("derives")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token 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syntax:")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("given")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("MyEnv"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" EnvSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("Auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("derived\n")])])])])],1),t._v(" "),a("h3",{attrs:{id:"deriving-fields-from-case-class-methods-scala-3-only"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#deriving-fields-from-case-class-methods-scala-3-only"}},[t._v("#")]),t._v(" Deriving fields from case class methods (Scala 3 only)")]),t._v(" "),a("p",[t._v("In certain cases, your type might contain fields whose value depends on other fields. For example, you might have a "),a("code",[t._v("Person")]),t._v(" type with a "),a("code",[t._v("fullName")]),t._v(" field that is derived from the "),a("code",[t._v("firstName")]),t._v(" and "),a("code",[t._v("lastName")]),t._v(" fields. In this case, you can use the "),a("code",[t._v("@GQLField")]),t._v(" annotation to indicate that the field should be derived from the method with the same name.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Annotations"),a("span",{pre:!0,attrs:{class:"token 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"),a("span",{pre:!0,attrs:{class:"token annotation punctuation"}},[t._v("@GQLField")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("def")]),t._v(" fullName"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string-interpolation"}},[a("span",{pre:!0,attrs:{class:"token id function"}},[t._v("s")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"')]),a("span",{pre:!0,attrs:{class:"token interpolation"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("$")]),a("span",{pre:!0,attrs:{class:"token expression"}},[t._v("firstName")])]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v(" ")]),a("span",{pre:!0,attrs:{class:"token interpolation"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("$")]),a("span",{pre:!0,attrs:{class:"token expression"}},[t._v("lastName")])]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"')])]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("This case class will generate the following GraphQL type:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Person")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("firstName")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("lastName")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("fullName")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("The methods annotated with "),a("code",[t._v("@GQLField")]),t._v(" can return any type for which a "),a("code",[t._v("Schema")]),t._v(" is defined for, including effects such as "),a("code",[t._v("ZIO")]),t._v(" and "),a("code",[t._v("ZQuery")]),t._v(".\nIn addition, you can use any other annotation that is supported for case class arguments, such as 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If you need to derive a field that requires arguments, you can return a function instead.")]),t._v(" "),a("li",[t._v("The method must be public (i.e. not "),a("code",[t._v("private")]),t._v(" or "),a("code",[t._v("protected")]),t._v(").")]),t._v(" "),a("li",[t._v("It currently only works with methods (i.e., "),a("code",[t._v("def")]),t._v("). If you need to cache the output of the method, you can create a private lazy val and return it from the method.")]),t._v(" "),a("li",[t._v("It is not compatible with ahead-of-time compilation (e.g., generating a GraalVM native-image executable).")])])]),t._v(" "),a("h2",{attrs:{id:"arguments"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#arguments"}},[t._v("#")]),t._v(" Arguments")]),t._v(" "),a("p",[t._v("To declare a field that take arguments, create a dedicated case class representing the arguments and make the field a "),a("em",[t._v("function")]),t._v(" from this class to the result type.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("name"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" origin"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" FilterArgs"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("origin"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Option"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("characters"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" FilterArgs "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("The snippet above will produce the following GraphQL type:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Queries")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("characters")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("origin")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Origin")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Character")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("Caliban provides auto-derivation for common types such as "),a("code",[t._v("Int")]),t._v(", "),a("code",[t._v("String")]),t._v(", "),a("code",[t._v("List")]),t._v(", "),a("code",[t._v("Option")]),t._v(", etc. but you can also support your own types by providing an implicit instance of "),a("code",[t._v("ArgBuilder")]),t._v(" that defines how incoming arguments from that types should be extracted. You also need a "),a("code",[t._v("Schema")]),t._v(" for those types.")]),t._v(" "),a("p",[t._v("Derivation of "),a("code",[t._v("ArgBuilder")]),t._v(" for case classes works similarly to "),a("code",[t._v("Schema")]),t._v(" derivation. You can use auto derivation by adding the following import:")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("ArgBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("_\n")])])]),a("p",[t._v("Or you can use semi-auto derivation as follows:")]),t._v(" "),a("code-group",[a("code-block",{attrs:{title:"Scala 2",active:""}},[a("div",{staticClass:"language-scala mdoc:silent:reset extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token 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If you have multiple arguments, use a case class containing all of them instead of a tuple.")])]),t._v(" "),a("h2",{attrs:{id:"custom-types"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#custom-types"}},[t._v("#")]),t._v(" Custom types")]),t._v(" "),a("p",[t._v("Caliban provides auto-derivation for common types such as "),a("code",[t._v("Int")]),t._v(", "),a("code",[t._v("String")]),t._v(", "),a("code",[t._v("List")]),t._v(", "),a("code",[t._v("Option")]),t._v(", etc. but you can also support your own types by providing an implicit instance of "),a("code",[t._v("Schema")]),t._v(". Note that you don't have to do this if your types are just case classes composed of common types.")]),t._v(" "),a("p",[t._v("An easy way to do this is to reuse existing instances and use "),a("code",[t._v("contramap")]),t._v(" to map from your type to the original type. 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This allows you to leverage all the features provided by ZIO: timeouts, retries, access to ZIO environment, memoizing, etc. An effect will be run every time a query requiring the corresponding field is executed.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent:reset extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("zio"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" CharacterName "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("name"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" CharacterName"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("characters"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Task"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n character"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" CharacterName "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" RIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Console"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("If you don't use ZIO environment ("),a("code",[t._v("R")]),t._v(" = "),a("code",[t._v("Any")]),t._v("), there is nothing special to do to get it working.")]),t._v(" "),a("p",[t._v("If you require a ZIO environment and use Scala 2, you can't use "),a("code",[t._v("Schema.gen")]),t._v(" or the import we saw previously because they expect "),a("code",[t._v("R")]),t._v(" to be "),a("code",[t._v("Any")]),t._v(". Instead, you need to make a new object that extends "),a("code",[t._v("caliban.schema.GenericSchema[R]")]),t._v(" for your custom "),a("code",[t._v("R")]),t._v(". Then you can use "),a("code",[t._v("gen")]),t._v(" or "),a("code",[t._v("auto")]),t._v(" from that object to generate your schema.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" MyEnv "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Console \n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" customSchema "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" GenericSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("MyEnv"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("customSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// if you use semi-auto generation, use this instead:")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// implicit val characterSchema: Schema[MyEnv, Character] = customSchema.gen")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// implicit val queriesSchema: Schema[MyEnv, Queries] = customSchema.gen")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" queries "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("ZIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("attempt"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" _ "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" ZIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("succeed"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" graphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("RootResolver"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("If you require a ZIO environment and use Scala 3, things are simpler since you don't need "),a("code",[t._v("GenericSchema")]),t._v(". Just make sure to use "),a("code",[t._v("Schema.gen")]),t._v(" with the proper R type parameter.\nTo make sure Caliban uses the proper environment, you need to specify it explicitly to "),a("code",[t._v("graphQL(...)")]),t._v(", unless you already have "),a("code",[t._v("Schema")]),t._v(" instances for your root operations in scope.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" queries "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("ZIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("attempt"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" _ "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" ZIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("succeed"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" graphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("MyEnv"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Unit")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Unit")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("RootResolver"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// or")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// implicit val queriesSchema: Schema[MyEnv, Queries] = Schema.gen")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// val api = graphQL(RootResolver(queries)) // it will infer MyEnv thanks to the instance above")]),t._v("\n")])])]),a("h2",{attrs:{id:"annotations"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#annotations"}},[t._v("#")]),t._v(" Annotations")]),t._v(" "),a("p",[t._v("Caliban supports a few annotations to enrich data types:")]),t._v(" "),a("ul",[a("li",[a("code",[t._v('@GQLName("name")')]),t._v(" allows you to specify a different name for a data type or a field.")]),t._v(" "),a("li",[a("code",[t._v('@GQLInputName("name")')]),t._v(" allows you to specify a different name for a data type used as an input (by default, the suffix "),a("code",[t._v("Input")]),t._v(" is appended to the type name).")]),t._v(" "),a("li",[a("code",[t._v('@GQLDescription("description")')]),t._v(" lets you provide a description for a data type or field. This description will be visible when your schema is introspected.")]),t._v(" "),a("li",[a("code",[t._v('@GQLDeprecated("reason")')]),t._v(" allows deprecating a field or an enum value.")]),t._v(" "),a("li",[a("code",[t._v("@GQLExcluded")]),t._v(" allows you to hide a field from the generated schema.")]),t._v(" "),a("li",[a("code",[t._v("@GQLInterface")]),t._v(" to force a sealed trait generating an interface instead of a union.")]),t._v(" "),a("li",[a("code",[t._v("@GQLDirective(directive: Directive)")]),t._v(" to add a directive to a field or type.")]),t._v(" "),a("li",[a("code",[t._v("@GQLValueType(isScalar)")]),t._v(" forces a type to behave as a value type for derivation. Meaning that caliban will ignore the outer type and take the first case class parameter as the real type. If "),a("code",[t._v("isScalar")]),t._v(" is true, it will generate a scalar named after the case class (default: false).")]),t._v(" "),a("li",[a("code",[t._v('@GQLDefault("defaultValue")')]),t._v(" allows you to specify a default value for an input field using GraphQL syntax. The default value will be visible in your schema's SDL and during introspection.")])]),t._v(" "),a("h2",{attrs:{id:"java-8-time-types"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#java-8-time-types"}},[t._v("#")]),t._v(" Java 8 Time types")]),t._v(" "),a("p",[t._v("Caliban provides implicit "),a("code",[t._v("Schema")]),t._v(" types for the standard "),a("code",[t._v("java.time")]),t._v(" types, by default these will use the\nISO standard strings for serialization and deserialization. However, you can customize this behavior by using\nexplicit constructor available under the "),a("code",[t._v("ArgBuilder")]),t._v(" companion object. For instance, you can specify an "),a("code",[t._v("instantEpoch")]),t._v("\nto handle instants which are encoded using a "),a("code",[t._v("Long")]),t._v(" from the standard java epoch time (January 1st 1970 00:00:00).\nFor some time formats you can also specify a specific "),a("code",[t._v("DateTimeFormatter")]),t._v(" to handle your particular date time needs.")]),t._v(" "),a("h2",{attrs:{id:"building-schemas-by-hand"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#building-schemas-by-hand"}},[t._v("#")]),t._v(" Building Schemas by hand")]),t._v(" "),a("p",[t._v("Sometimes for whatever reason schema generation fails. This can happen if your schema has co-recursive types and derivation is unable\nto generate a schema for them. In cases like these you may need to instead create your own schema by hand.")]),t._v(" "),a("p",[t._v("Consider the case where you have three types which create cyclical dependencies on one another")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("zio"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("UIO\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Group"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("id"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" users"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("User"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" parent"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Option"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Group"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" organization"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Organization"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Organization"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("id"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" groups"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Group"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" User"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("id"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" group"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Group"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("These three types all depend on one another and if you attempt to generate a schema from them you will either end up with compiler errors or you will end up with a nasty runtime\nerror from a "),a("code",[t._v("NullPointerException")]),t._v(". To help the compiler out we can hand generate the types for these case classes instead.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token 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"),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" Role\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" Mechanic "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" Role\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("The snippet above will produce the following GraphQL type:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("union")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Role")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Captain")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Engineer")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Mechanic")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Captain")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("shipName")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Engineer")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("specialty")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Mechanic")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("_")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("Boolean")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("If your type needs to be shared between multiple unions you can use the "),a("code",[t._v("@GQLValueType")]),t._v(" annotation to have caliban\nproxy to another type beyond the sealed trait.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Pilot"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("callSign"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("sealed")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("trait")]),t._v(" Role\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" Role "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Captain"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("shipName"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" Role\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Engineer"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("specialty"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" Role\n "),a("span",{pre:!0,attrs:{class:"token annotation punctuation"}},[t._v("@GQLValueType")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Proxy"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("pilot"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Pilot"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" Role\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("This will produce the following GraphQL Types:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("union")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Role")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Captain")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Engineer")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Pilot")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Captain")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("shipName")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Engineer")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("specialty")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Pilot")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("callSign")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("If you prefer an "),a("code",[t._v("Interface")]),t._v(" instead of a "),a("code",[t._v("Union")]),t._v(" type, add the "),a("code",[t._v("@GQLInterface")]),t._v(" annotation to your sealed trait.\nAn interface will be created with all the fields that are common to the case classes extending the sealed trait, as long as they return the same type.")]),t._v(" "),a("p",[t._v("If you prefer to have a "),a("code",[t._v("Union")]),t._v(" type instead of an "),a("code",[t._v("Enum")]),t._v(", even when the sealed trait contains only objects, add the "),a("code",[t._v("@GQLUnion")]),t._v(" annotation.")]),t._v(" "),a("h2",{attrs:{id:"case-classes-and-sealed-traits"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#case-classes-and-sealed-traits"}},[t._v("#")]),t._v(" Case classes and sealed traits")]),t._v(" "),a("p",[t._v("The transformation between Scala types and GraphQL types is handled by a typeclass named "),a("code",[t._v("Schema")]),t._v(". As mentioned earlier, Caliban provides instances of "),a("code",[t._v("Schema")]),t._v(" for all basic Scala types, but inevitably you will need to support your own types, in particular case classes and sealed traits.")]),t._v(" "),a("p",[t._v("Caliban is able to generate instances of "),a("code",[t._v("Schema")]),t._v(" for case classes and sealed traits. You have two choices for doing that: auto derivation and semi-auto derivation.")]),t._v(" "),a("h3",{attrs:{id:"auto-derivation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#auto-derivation"}},[t._v("#")]),t._v(" Auto derivation")]),t._v(" "),a("p",[t._v("Auto derivation is achieved easily by adding the following import:")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("_\n")])])]),a("p",[t._v("Using this import, Caliban will generate "),a("code",[t._v("Schema")]),t._v(" instances for all the case classes and sealed traits that are found inside your resolver.")]),t._v(" "),a("div",{staticClass:"custom-block warning"},[a("p",{staticClass:"custom-block-title"},[t._v("Limitations")]),t._v(" "),a("p",[t._v("Auto derivation is the easiest way to get started, but it has some drawbacks:")]),t._v(" "),a("ul",[a("li",[t._v("If a type is referenced in several places inside your resolver, a "),a("code",[t._v("Schema")]),t._v(" will be generated for each occurrence, which can lead to longer compilation times and a high amount of generated code (a sign of this is that the compiler will suggest increasing "),a("code",[t._v("-Xmax-inlines")]),t._v(" in Scala 3).")]),t._v(" "),a("li",[t._v("When a "),a("code",[t._v("Schema")]),t._v(" is missing for a nested type inside your resolver, it can sometimes be difficult to find out which type is missing when using auto derivation, because the error message will mention the root type and not the nested one.")]),t._v(" "),a("li",[t._v("The macro that generates the "),a("code",[t._v("Schema")]),t._v(" instances sometimes gets confused when there are a lot of nested or recursive types, and can mistakenly generate a "),a("code",[t._v("Schema")]),t._v(" for types that already have a "),a("code",[t._v("Schema")]),t._v(" in scope. For this reason, semi-auto derivation is recommended for non-trivial schemas.")])])]),t._v(" "),a("h3",{attrs:{id:"semi-auto-derivation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#semi-auto-derivation"}},[t._v("#")]),t._v(" Semi-auto derivation")]),t._v(" "),a("p",[t._v("Semi-auto derivation is achieved as follows for each type that needs a "),a("code",[t._v("Schema")]),t._v(" instance ("),a("code",[t._v("MyClass")]),t._v(" in the example):")]),t._v(" "),a("code-group",[a("code-block",{attrs:{title:"Scala 2",active:""}},[a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" MyClass"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("field"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" schemaForMyClass"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" MyClass"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("gen\n")])])])]),t._v(" "),a("code-block",{attrs:{title:"Scala 3"}},[a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" MyClass"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("field"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("derives")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("SemiAuto\n\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// if you don't want to use the `derives` syntax, you can also use the following:")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("given")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" MyClass"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("gen\n")])])])])],1),t._v(" "),a("p",[t._v("In Scala 3, derivation doesn't support value classes and opaque types. You can use "),a("code",[t._v("Schema.genDebug")]),t._v(" to print the generated code in the console.")]),t._v(" "),a("h3",{attrs:{id:"combining-auto-and-semi-auto-derivation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#combining-auto-and-semi-auto-derivation"}},[t._v("#")]),t._v(" Combining auto and semi-auto derivation")]),t._v(" "),a("p",[t._v("For some types such as enums, it might be desirable to use auto derivation to reduce boilerplate schema definitions:")]),t._v(" "),a("code-group",[a("code-block",{attrs:{title:"Scala 2",active:""}},[a("div",{staticClass:"language-scala mdoc:silent:reset extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token 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syntax:")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("given")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("MyEnv"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" EnvSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("Auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("derived\n")])])])])],1),t._v(" "),a("h3",{attrs:{id:"deriving-fields-from-case-class-methods-scala-3-only"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#deriving-fields-from-case-class-methods-scala-3-only"}},[t._v("#")]),t._v(" Deriving fields from case class methods (Scala 3 only)")]),t._v(" "),a("p",[t._v("In certain cases, your type might contain fields whose value depends on other fields. For example, you might have a "),a("code",[t._v("Person")]),t._v(" type with a "),a("code",[t._v("fullName")]),t._v(" field that is derived from the "),a("code",[t._v("firstName")]),t._v(" and "),a("code",[t._v("lastName")]),t._v(" fields. In this case, you can use the "),a("code",[t._v("@GQLField")]),t._v(" annotation to indicate that the field should be derived from the method with the same name.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Annotations"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("GQLField\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Person"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n firstName"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n lastName"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("derives")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("SemiAuto "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token annotation punctuation"}},[t._v("@GQLField")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("def")]),t._v(" fullName"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string-interpolation"}},[a("span",{pre:!0,attrs:{class:"token id function"}},[t._v("s")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"')]),a("span",{pre:!0,attrs:{class:"token interpolation"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("$")]),a("span",{pre:!0,attrs:{class:"token expression"}},[t._v("firstName")])]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v(" ")]),a("span",{pre:!0,attrs:{class:"token interpolation"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("$")]),a("span",{pre:!0,attrs:{class:"token expression"}},[t._v("lastName")])]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"')])]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("This case class will generate the following GraphQL type:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Person")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("firstName")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("lastName")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("fullName")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("The methods annotated with "),a("code",[t._v("@GQLField")]),t._v(" can return any type for which a "),a("code",[t._v("Schema")]),t._v(" is defined for, including effects such as "),a("code",[t._v("ZIO")]),t._v(" and "),a("code",[t._v("ZQuery")]),t._v(".\nIn addition, you can use any other annotation that is supported for case class arguments, such as "),a("code",[t._v("@GQLName")]),t._v(", "),a("code",[t._v("@GQLDescription")]),t._v(" and "),a("code",[t._v("@GQLDeprecated")]),t._v(".")]),t._v(" "),a("div",{staticClass:"custom-block warning"},[a("p",{staticClass:"custom-block-title"},[t._v("Caveats")]),t._v(" "),a("p",[t._v("Derivation of fields via the "),a("code",[t._v("@GQLField")]),t._v(" annotation can be convenient in certain cases, but has the following limitations:")]),t._v(" "),a("ul",[a("li",[t._v("The method cannot take arguments. If you need to derive a field that requires arguments, you can return a function instead.")]),t._v(" "),a("li",[t._v("The method must be public (i.e. not "),a("code",[t._v("private")]),t._v(" or "),a("code",[t._v("protected")]),t._v(").")]),t._v(" "),a("li",[t._v("It currently only works with methods (i.e., "),a("code",[t._v("def")]),t._v("). If you need to cache the output of the method, you can create a private lazy val and return it from the method.")]),t._v(" "),a("li",[t._v("It is not compatible with ahead-of-time compilation (e.g., generating a GraalVM native-image executable).")])])]),t._v(" "),a("h2",{attrs:{id:"arguments"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#arguments"}},[t._v("#")]),t._v(" Arguments")]),t._v(" "),a("p",[t._v("To declare a field that take arguments, create a dedicated case class representing the arguments and make the field a "),a("em",[t._v("function")]),t._v(" from this class to the result type.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("name"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" origin"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" FilterArgs"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("origin"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Option"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("characters"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" FilterArgs "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("The snippet above will produce the following GraphQL type:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Queries")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("characters")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("origin")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Origin")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Character")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("Caliban provides auto-derivation for common types such as "),a("code",[t._v("Int")]),t._v(", "),a("code",[t._v("String")]),t._v(", "),a("code",[t._v("List")]),t._v(", "),a("code",[t._v("Option")]),t._v(", etc. but you can also support your own types by providing an implicit instance of "),a("code",[t._v("ArgBuilder")]),t._v(" that defines how incoming arguments from that types should be extracted. You also need a "),a("code",[t._v("Schema")]),t._v(" for those types.")]),t._v(" "),a("p",[t._v("Derivation of "),a("code",[t._v("ArgBuilder")]),t._v(" for case classes works similarly to "),a("code",[t._v("Schema")]),t._v(" derivation. You can use auto derivation by adding the following import:")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("ArgBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("_\n")])])]),a("p",[t._v("Or you can use semi-auto derivation as follows:")]),t._v(" "),a("code-group",[a("code-block",{attrs:{title:"Scala 2",active:""}},[a("div",{staticClass:"language-scala mdoc:silent:reset extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token 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If you have multiple arguments, use a case class containing all of them instead of a tuple.")])]),t._v(" "),a("h2",{attrs:{id:"custom-types"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#custom-types"}},[t._v("#")]),t._v(" Custom types")]),t._v(" "),a("p",[t._v("Caliban provides auto-derivation for common types such as "),a("code",[t._v("Int")]),t._v(", "),a("code",[t._v("String")]),t._v(", "),a("code",[t._v("List")]),t._v(", "),a("code",[t._v("Option")]),t._v(", etc. but you can also support your own types by providing an implicit instance of "),a("code",[t._v("Schema")]),t._v(". Note that you don't have to do this if your types are just case classes composed of common types.")]),t._v(" "),a("p",[t._v("An easy way to do this is to reuse existing instances and use "),a("code",[t._v("contramap")]),t._v(" to map from your type to the original type. Here's an example of creating an instance for "),a("a",{attrs:{href:"https://github.com/fthomas/refined",target:"_blank",rel:"noopener noreferrer"}},[t._v("refined"),a("OutboundLink")],1),t._v("'s "),a("code",[t._v("NonEmptyString")]),t._v(" reusing existing instance for "),a("code",[t._v("String")]),t._v(" (if you use "),a("code",[t._v("refined")]),t._v(", you might want to look at "),a("a",{attrs:{href:"https://github.com/niqdev/caliban-extras#caliban-refined",target:"_blank",rel:"noopener noreferrer"}},[t._v("caliban-refined"),a("OutboundLink")],1),t._v("):")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" nonEmptyStringSchema"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" NonEmptyString"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" \n Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("stringSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("contramap"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("_"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("You can also use the "),a("code",[t._v("scalarSchema")]),t._v(" helper to create your own scalar types, providing a name, an optional description, and a function from your type to a "),a("code",[t._v("ResponseValue")]),t._v(":")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent:reset extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("ResponseValue"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("ObjectValue\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" unitSchema"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Unit")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("scalarSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Unit"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" None"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" None"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" None"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" _ "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" ObjectValue"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("Nil"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("If you are using a custom type as part of the input you also have to provide an implicit instance of "),a("code",[t._v("ArgBuilder")]),t._v(". For example here's how to do that for "),a("code",[t._v("java.time.LocalDate")]),t._v(":")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("java"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("time"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("LocalDate\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("scala"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("util"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Try\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token 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This allows you to leverage all the features provided by ZIO: timeouts, retries, access to ZIO environment, memoizing, etc. An effect will be run every time a query requiring the corresponding field is executed.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent:reset extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("zio"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" CharacterName "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("name"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" CharacterName"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("characters"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Task"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n character"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" CharacterName "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" RIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Console"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("If you don't use ZIO environment ("),a("code",[t._v("R")]),t._v(" = "),a("code",[t._v("Any")]),t._v("), there is nothing special to do to get it working.")]),t._v(" "),a("p",[t._v("If you require a ZIO environment and use Scala 2, you can't use "),a("code",[t._v("Schema.gen")]),t._v(" or the import we saw previously because they expect "),a("code",[t._v("R")]),t._v(" to be "),a("code",[t._v("Any")]),t._v(". Instead, you need to make a new object that extends "),a("code",[t._v("caliban.schema.GenericSchema[R]")]),t._v(" for your custom "),a("code",[t._v("R")]),t._v(". Then you can use "),a("code",[t._v("gen")]),t._v(" or "),a("code",[t._v("auto")]),t._v(" from that object to generate your schema.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" MyEnv "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Console \n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" customSchema "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" GenericSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("MyEnv"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("customSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// if you use semi-auto generation, use this instead:")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// implicit val characterSchema: Schema[MyEnv, Character] = customSchema.gen")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// implicit val queriesSchema: Schema[MyEnv, Queries] = customSchema.gen")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" queries "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("ZIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("attempt"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" _ "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" ZIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("succeed"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" graphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("RootResolver"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("If you require a ZIO environment and use Scala 3, things are simpler since you don't need "),a("code",[t._v("GenericSchema")]),t._v(". Just make sure to use "),a("code",[t._v("Schema.gen")]),t._v(" with the proper R type parameter.\nTo make sure Caliban uses the proper environment, you need to specify it explicitly to "),a("code",[t._v("graphQL(...)")]),t._v(", unless you already have "),a("code",[t._v("Schema")]),t._v(" instances for your root operations in scope.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" queries "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("ZIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("attempt"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" _ "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" ZIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("succeed"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" graphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("MyEnv"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Unit")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Unit")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("RootResolver"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// or")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// implicit val queriesSchema: Schema[MyEnv, Queries] = Schema.gen")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// val api = graphQL(RootResolver(queries)) // it will infer MyEnv thanks to the instance above")]),t._v("\n")])])]),a("h2",{attrs:{id:"subscriptions"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#subscriptions"}},[t._v("#")]),t._v(" Subscriptions")]),t._v(" "),a("p",[t._v("All the fields of the subscription root case class MUST return "),a("code",[t._v("ZStream")]),t._v(" or "),a("code",[t._v("? => ZStream")]),t._v(" objects.")]),t._v(" "),a("p",[t._v("The "),a("RouterLink",{attrs:{to:"/docs/interop.html"}},[t._v("cats and monix interop modules")]),t._v(" also let you use fs2 "),a("code",[t._v("Stream")]),t._v(" and monix "),a("code",[t._v("Observable")]),t._v(" respectively.")],1),t._v(" "),a("h2",{attrs:{id:"annotations"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#annotations"}},[t._v("#")]),t._v(" Annotations")]),t._v(" "),a("p",[t._v("Caliban supports a few annotations to enrich data types:")]),t._v(" "),a("ul",[a("li",[a("code",[t._v('@GQLName("name")')]),t._v(" allows you to specify a different name for a data type or a field.")]),t._v(" "),a("li",[a("code",[t._v('@GQLInputName("name")')]),t._v(" allows you to specify a different name for a data type used as an input (by default, the suffix "),a("code",[t._v("Input")]),t._v(" is appended to the type name).")]),t._v(" "),a("li",[a("code",[t._v('@GQLDescription("description")')]),t._v(" lets you provide a description for a data type or field. This description will be visible when your schema is introspected.")]),t._v(" "),a("li",[a("code",[t._v('@GQLDeprecated("reason")')]),t._v(" allows deprecating a field or an enum value.")]),t._v(" "),a("li",[a("code",[t._v("@GQLExcluded")]),t._v(" allows you to hide a field from the generated schema.")]),t._v(" "),a("li",[a("code",[t._v("@GQLInterface")]),t._v(" to force a sealed trait generating an interface instead of a union.")]),t._v(" "),a("li",[a("code",[t._v("@GQLDirective(directive: Directive)")]),t._v(" to add a directive to a field or type.")]),t._v(" "),a("li",[a("code",[t._v("@GQLValueType(isScalar)")]),t._v(" forces a type to behave as a value type for derivation. Meaning that caliban will ignore the outer type and take the first case class parameter as the real type. If "),a("code",[t._v("isScalar")]),t._v(" is true, it will generate a scalar named after the case class (default: false).")]),t._v(" "),a("li",[a("code",[t._v('@GQLDefault("defaultValue")')]),t._v(" allows you to specify a default value for an input field using GraphQL syntax. The default value will be visible in your schema's SDL and during introspection.")])]),t._v(" "),a("h2",{attrs:{id:"java-8-time-types"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#java-8-time-types"}},[t._v("#")]),t._v(" Java 8 Time types")]),t._v(" "),a("p",[t._v("Caliban provides implicit "),a("code",[t._v("Schema")]),t._v(" types for the standard "),a("code",[t._v("java.time")]),t._v(" types, by default these will use the\nISO standard strings for serialization and deserialization. However, you can customize this behavior by using\nexplicit constructor available under the "),a("code",[t._v("ArgBuilder")]),t._v(" companion object. For instance, you can specify an "),a("code",[t._v("instantEpoch")]),t._v("\nto handle instants which are encoded using a "),a("code",[t._v("Long")]),t._v(" from the standard java epoch time (January 1st 1970 00:00:00).\nFor some time formats you can also specify a specific "),a("code",[t._v("DateTimeFormatter")]),t._v(" to handle your particular date time needs.")]),t._v(" "),a("h2",{attrs:{id:"building-schemas-by-hand"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#building-schemas-by-hand"}},[t._v("#")]),t._v(" Building Schemas by hand")]),t._v(" "),a("p",[t._v("Sometimes for whatever reason schema generation fails. This can happen if your schema has co-recursive types and derivation is unable\nto generate a schema for them. In cases like these you may need to instead create your own schema by hand.")]),t._v(" "),a("p",[t._v("Consider the case where you have three types which create cyclical dependencies on one another")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("zio"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("UIO\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Group"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("id"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" users"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("User"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" parent"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Option"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Group"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" organization"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Organization"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Organization"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("id"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" groups"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Group"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" User"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("id"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" group"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Group"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("These three types all depend on one another and if you attempt to generate a schema from them you will either end up with compiler errors or you will end up with a nasty runtime\nerror from a "),a("code",[t._v("NullPointerException")]),t._v(". To help the compiler out we can hand generate the types for these case classes instead.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token 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Default: "),a("code",[t._v(".scalafmt.conf")]),t._v(".")]),t._v(" "),a("li",[a("code",[t._v("headers")]),t._v(": Provides request headers when "),a("code",[t._v("schemaPath")]),t._v(" is a URL.")]),t._v(" "),a("li",[a("code",[t._v("packageName")]),t._v(": Overrides the package name derived from the folder of "),a("code",[t._v("outputPath")]),t._v(".")]),t._v(" "),a("li",[a("code",[t._v("effect")]),t._v(": Overrides the default effect ("),a("code",[t._v("zio.UIO")]),t._v(") for wrapping fields in Queries and Mutations.")]),t._v(" "),a("li",[a("code",[t._v("scalarMappings")]),t._v(": Forces a mapping between a GraphQL type and a Scala class (e.g., scalars).")]),t._v(" "),a("li",[a("code",[t._v("imports")]),t._v(": Adds additional imports to the generated code.")]),t._v(" "),a("li",[a("code",[t._v("abstractEffectType")]),t._v(": Indicates that the effect type is abstract. Fields in Queries and Mutations will return "),a("code",[t._v("F[_]")]),t._v(".")]),t._v(" "),a("li",[a("code",[t._v("preserveInputNames")]),t._v(": Disables the default behavior of appending "),a("code",[t._v("Input")]),t._v(" to the type name of input types in the derived schema.")]),t._v(" "),a("li",[a("code",[t._v("addDerives")]),t._v(": Adds "),a("code",[t._v("derives")]),t._v(" clauses for type class instance derivation in Scala 3.")]),t._v(" "),a("li",[a("code",[t._v("envForDerives")]),t._v(": Specifies the type alias for your ZIO Environment when using "),a("code",[t._v("derives")]),t._v(" and a ZIO Environment other than "),a("code",[t._v("Any")]),t._v(".")])]),t._v(" "),a("h2",{attrs:{id:"lazy-evaluation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#lazy-evaluation"}},[t._v("#")]),t._v(" Lazy evaluation")]),t._v(" "),a("p",[t._v("The main difference between generating code for client usage and for server usage is that on the server you need to account for\ncode which should only be evaluated if the client requests the field!")]),t._v(" "),a("p",[t._v("You can annotate this directly in the graphql schema by creating a "),a("code",[t._v("@lazy")]),t._v(" directive.")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("directive")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@lazy")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("on")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("FIELD_DEFINITION")]),t._v("\n")])])]),a("p",[t._v("You can then annotate fields in the graphql schema like this:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("directive")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@lazy")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("on")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("FIELD_DEFINITION")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("MyType")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("myLazyField")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@lazy")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("myField")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("And you'll get a case class which looks something like this:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" MyType"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("myLazyField"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" zio"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" myField"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("When implementing this, "),a("code",[t._v("myLazyField")]),t._v(" will only be evaluated if the client requested it in the query")]),t._v(" "),a("h2",{attrs:{id:"newtype-declaration"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#newtype-declaration"}},[t._v("#")]),t._v(" Newtype declaration")]),t._v(" "),a("p",[t._v("The "),a("code",[t._v("@newtype")]),t._v(" directive in caliban allows you to wrap your GraphQL fields into statically\ntyped IDs for backend. For clients, they can use the GraphQL as before and do not\nhave to adjust their typing, or optionally can generate stronger typed IDs using\nthe directive.")]),t._v(" "),a("p",[t._v("In the following example we want to encapsulate "),a("code",[t._v("id : ID")]),t._v(" as FooId for better type safety, so\nwe use the "),a("code",[t._v("@newtype")]),t._v(" directive on the "),a("code",[t._v("Query")]),t._v(" and Foo object type.\nOn mutation, we are passing an optional field of String. To avoid mixing with other String\ntypes in backend code we decided to create a "),a("code",[t._v("@newtype")]),t._v(" of Bar instead.")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("directive")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@newtype")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("on")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("FIELD_DEFINITION")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("ARGUMENT_DEFINITION")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("INPUT_FIELD_DEFINITION")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Query")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token property-query"}},[t._v("getFoo")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("id")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("ID")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@newtype")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"FooId"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Foo")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Mutation")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("updateFoo")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("foo")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token atom-input class-name"}},[t._v("FooInput")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Foo")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Foo")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("id")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("ID")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@newtype")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"FooId"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("...")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("input")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token atom-input class-name"}},[t._v("FooInput")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("maybeBar")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@newtype")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Bar"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("...")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("With Scalar mapping for ID set to Int, it would give you the following case classes.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Bar"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("AnyVal")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" FooId"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Int")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("AnyVal")]),t._v("\n")])])]),a("p",[t._v("The "),a("code",[t._v("extends AnyVal")]),t._v(" ensures type erasure in such a way that we do not have to consider this abstraction\non client side, and hence graphql query remains the same as before applying the directive.\nBut for this to work we need to supply some implicit for our schema to understand the AnyVal\nconversion and mapping of the return values using "),a("code",[t._v("@GQLDirective")]),t._v(" annotation.")]),t._v(" "),a("p",[t._v("With this in place our generate type code should look something like this:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" Types "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("final")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" QueryGetFooArgs"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("id"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" FooId"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("final")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" MutationUpdateFooArgs"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("foo"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" FooInput"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n \n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Bar"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("AnyVal")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" Bar "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" schema"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Bar"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" implicitly"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token 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true\n")])])]),a("h2",{attrs:{id:"options"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#options"}},[t._v("#")]),t._v(" Options")]),t._v(" "),a("ul",[a("li",[a("code",[t._v("scalafmtPath")]),t._v(": Specifies the configuration file for Scalafmt. Default: "),a("code",[t._v(".scalafmt.conf")]),t._v(".")]),t._v(" "),a("li",[a("code",[t._v("headers")]),t._v(": Provides request headers when "),a("code",[t._v("schemaPath")]),t._v(" is a URL.")]),t._v(" "),a("li",[a("code",[t._v("packageName")]),t._v(": Overrides the package name derived from the folder of "),a("code",[t._v("outputPath")]),t._v(".")]),t._v(" "),a("li",[a("code",[t._v("effect")]),t._v(": Overrides the default effect ("),a("code",[t._v("zio.UIO")]),t._v(") for wrapping fields in Queries and Mutations.")]),t._v(" "),a("li",[a("code",[t._v("scalarMappings")]),t._v(": Forces a mapping between a GraphQL type and a Scala class (e.g., scalars).")]),t._v(" "),a("li",[a("code",[t._v("imports")]),t._v(": Adds additional imports to the generated code.")]),t._v(" "),a("li",[a("code",[t._v("abstractEffectType")]),t._v(": Indicates that the effect type is abstract. Fields in Queries and Mutations will return "),a("code",[t._v("F[_]")]),t._v(".")]),t._v(" "),a("li",[a("code",[t._v("preserveInputNames")]),t._v(": Disables the default behavior of appending "),a("code",[t._v("Input")]),t._v(" to the type name of input types in the derived schema.")]),t._v(" "),a("li",[a("code",[t._v("addDerives")]),t._v(": Adds "),a("code",[t._v("derives")]),t._v(" clauses for type class instance derivation in Scala 3.")]),t._v(" "),a("li",[a("code",[t._v("envForDerives")]),t._v(": Specifies the type alias for your ZIO Environment when using "),a("code",[t._v("derives")]),t._v(" and a ZIO Environment other than "),a("code",[t._v("Any")]),t._v(".")])]),t._v(" "),a("h2",{attrs:{id:"lazy-evaluation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#lazy-evaluation"}},[t._v("#")]),t._v(" Lazy evaluation")]),t._v(" "),a("p",[t._v("The main difference between generating code for client usage and for server usage is that on the server you need to account for\ncode which should only be evaluated if the client requests the field!")]),t._v(" "),a("p",[t._v("You can annotate this directly in the graphql schema by creating a "),a("code",[t._v("@lazy")]),t._v(" directive.")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("directive")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@lazy")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("on")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("FIELD_DEFINITION")]),t._v("\n")])])]),a("p",[t._v("You can then annotate fields in the graphql schema like this:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("directive")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@lazy")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("on")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("FIELD_DEFINITION")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("MyType")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("myLazyField")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@lazy")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("myField")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("And you'll get a case class which looks something like this:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" MyType"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("myLazyField"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" zio"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" myField"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("When implementing this, "),a("code",[t._v("myLazyField")]),t._v(" will only be evaluated if the client requested it in the query")]),t._v(" "),a("h2",{attrs:{id:"newtype-declaration"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#newtype-declaration"}},[t._v("#")]),t._v(" Newtype declaration")]),t._v(" "),a("p",[t._v("The "),a("code",[t._v("@newtype")]),t._v(" directive in caliban allows you to wrap your GraphQL fields into statically\ntyped IDs for backend. For clients, they can use the GraphQL as before and do not\nhave to adjust their typing, or optionally can generate stronger typed IDs using\nthe directive.")]),t._v(" "),a("p",[t._v("In the following example we want to encapsulate "),a("code",[t._v("id : ID")]),t._v(" as FooId for better type safety, so\nwe use the "),a("code",[t._v("@newtype")]),t._v(" directive on the "),a("code",[t._v("Query")]),t._v(" and Foo object type.\nOn mutation, we are passing an optional field of String. To avoid mixing with other String\ntypes in backend code we decided to create a "),a("code",[t._v("@newtype")]),t._v(" of Bar instead.")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("directive")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@newtype")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("on")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("FIELD_DEFINITION")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("ARGUMENT_DEFINITION")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("INPUT_FIELD_DEFINITION")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Query")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token property-query"}},[t._v("getFoo")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("id")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("ID")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@newtype")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"FooId"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Foo")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Mutation")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("updateFoo")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("foo")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token atom-input class-name"}},[t._v("FooInput")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Foo")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Foo")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("id")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("ID")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@newtype")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"FooId"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("...")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("input")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token atom-input class-name"}},[t._v("FooInput")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("maybeBar")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@newtype")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Bar"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("...")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("With Scalar mapping for ID set to Int, it would give you the following case classes.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Bar"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("AnyVal")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" FooId"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Int")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("AnyVal")]),t._v("\n")])])]),a("p",[t._v("The "),a("code",[t._v("extends AnyVal")]),t._v(" ensures type erasure in such a way that we do not have to consider this abstraction\non client side, and hence graphql query remains the same as before applying the directive.\nBut for this to work we need to supply some implicit for our schema to understand the AnyVal\nconversion and mapping of the return values using "),a("code",[t._v("@GQLDirective")]),t._v(" annotation.")]),t._v(" "),a("p",[t._v("With this in place our generate type code should look something like this:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" Types "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("final")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" QueryGetFooArgs"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("id"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" FooId"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("final")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" MutationUpdateFooArgs"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("foo"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" FooInput"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n \n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Bar"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("AnyVal")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" Bar "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" schema"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Bar"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" implicitly"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("contramap"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("_"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" argBuilder"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" ArgBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Bar"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" implicitly"),a("span",{pre:!0,attrs:{class:"token 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- + diff --git a/docs/docs/client-codegen.html b/docs/docs/client-codegen.html index 033f8e555..a537460c5 100644 --- a/docs/docs/client-codegen.html +++ b/docs/docs/client-codegen.html @@ -8,7 +8,7 @@ - + @@ -140,6 +140,6 @@ →

- + diff --git a/docs/docs/client.html b/docs/docs/client.html index 957060ded..dbab09dc9 100644 --- a/docs/docs/client.html +++ b/docs/docs/client.html @@ -8,7 +8,7 @@ - + @@ -101,6 +101,6 @@ →

- + diff --git a/docs/docs/examples.html b/docs/docs/examples.html index 054c81ae3..840b388d9 100644 --- a/docs/docs/examples.html +++ b/docs/docs/examples.html @@ -8,7 +8,7 @@ - + @@ -41,6 +41,6 @@

- + diff --git a/docs/docs/federation.html b/docs/docs/federation.html index 068d06fae..1c45d871b 100644 --- a/docs/docs/federation.html +++ b/docs/docs/federation.html @@ -8,7 +8,7 @@ - + @@ -105,6 +105,6 @@ →

- + diff --git a/docs/docs/index.html b/docs/docs/index.html index a6ae7c4c6..8c84c8505 100644 --- a/docs/docs/index.html +++ b/docs/docs/index.html @@ -8,7 +8,7 @@ - + @@ -85,10 +85,10 @@ "com.github.ghostdogpr" %% "caliban-federation" % "2.6.0" // apollo federation "com.github.ghostdogpr" %% "caliban-reporting" % "2.6.0" // apollo schema reporting "com.github.ghostdogpr" %% "caliban-tracing" % "2.6.0" // open-telemetry -

Support for JSON encoding / decoding of the inputs and responses for tapir-based adapters is enabled by adding one of the following dependencies to your build.sbt file:

"com.softwaremill.sttp.tapir" %% "tapir-json-circe"     % "1.2.11" // circe
-"com.softwaremill.sttp.tapir" %% "tapir-jsoniter-scala" % "1.2.11" // jsoniter
-"com.softwaremill.sttp.tapir" %% "tapir-json-play"      % "1.2.11" // play-json
-"com.softwaremill.sttp.tapir" %% "tapir-json-zio"       % "1.2.11" // zio-json
+

Support for JSON encoding / decoding of the inputs and responses for tapir-based adapters is enabled by adding one of the following dependencies to your build.sbt file:

"com.softwaremill.sttp.tapir" %% "tapir-json-circe"     % "1.10.7" // circe
+"com.softwaremill.sttp.tapir" %% "tapir-jsoniter-scala" % "1.10.7" // jsoniter
+"com.softwaremill.sttp.tapir" %% "tapir-json-play"      % "1.10.7" // play-json
+"com.softwaremill.sttp.tapir" %% "tapir-json-zio"       % "1.10.7" // zio-json

And then later in your code (you only need one!):

import sttp.tapir.json.circe._
 import sttp.tapir.json.jsoniter._
 import sttp.tapir.json.play._
@@ -98,6 +98,6 @@
       
       →
- + diff --git a/docs/docs/interop.html b/docs/docs/interop.html index 10d20011a..7b7dc80e4 100644 --- a/docs/docs/interop.html +++ b/docs/docs/interop.html @@ -8,7 +8,7 @@ - + @@ -244,6 +244,6 @@ →

- + diff --git a/docs/docs/laminext.html b/docs/docs/laminext.html index 0de6eccfc..f12eaa5a3 100644 --- a/docs/docs/laminext.html +++ b/docs/docs/laminext.html @@ -8,7 +8,7 @@ - + @@ -69,6 +69,6 @@ →

- + diff --git a/docs/docs/middleware.html b/docs/docs/middleware.html index aedc96dba..0191376f1 100644 --- a/docs/docs/middleware.html +++ b/docs/docs/middleware.html @@ -8,7 +8,7 @@ - + @@ -192,6 +192,6 @@ →

- + diff --git a/docs/docs/optimization.html b/docs/docs/optimization.html index 439161f9c..a9e5f79c5 100644 --- a/docs/docs/optimization.html +++ b/docs/docs/optimization.html @@ -8,7 +8,7 @@ - + @@ -162,6 +162,6 @@ →

- + diff --git a/docs/docs/relay-connections.html b/docs/docs/relay-connections.html index bca56216f..06ed364fb 100644 --- a/docs/docs/relay-connections.html +++ b/docs/docs/relay-connections.html @@ -8,7 +8,7 @@ - + @@ -142,6 +142,6 @@ →

- + diff --git a/docs/docs/schema-comparison.html b/docs/docs/schema-comparison.html index 046d19735..6754584c6 100644 --- a/docs/docs/schema-comparison.html +++ b/docs/docs/schema-comparison.html @@ -8,7 +8,7 @@ - + @@ -75,6 +75,6 @@ →

- + diff --git a/docs/docs/schema-reporting.html b/docs/docs/schema-reporting.html index 97e355b19..a0dd3b5ce 100644 --- a/docs/docs/schema-reporting.html +++ b/docs/docs/schema-reporting.html @@ -8,7 +8,7 @@ - + @@ -69,6 +69,6 @@ →

- + diff --git a/docs/docs/schema.html b/docs/docs/schema.html index 0b302a3fe..7f91918f3 100644 --- a/docs/docs/schema.html +++ b/docs/docs/schema.html @@ -8,7 +8,7 @@ - + @@ -36,7 +36,7 @@ Github (opens new window)
Scaladoc - (opens new window)

# Schema generation

A GraphQL schema will be derived automatically at compile-time (no reflection) from the types present in your resolver.

If you're more interested in the schema-first approach, it is also possible to generate the Scala code from a GraphQL schema file.

The table below shows how common Scala types are converted to GraphQL types.

Scala Type GraphQL Type
Boolean Boolean
Int Int
Float Float
Double Float
String String
java.util.UUID ID
Unit Unit (custom scalar)
Long Long (custom scalar)
BigInt BigInt (custom scalar)
BigDecimal BigDecimal (custom scalar)
java.time.Instant Instant (custom scalar)
java.time.LocalDate LocalDate (custom scalar)
java.time.LocalTime LocalTime (custom scalar)
java.time.LocalDateTime LocalDateTime (custom scalar)
java.time.OffsetDateTime OffsetDateTime (custom scalar)
java.time.ZonedDateTime ZonedDateTime (custom scalar)
Case Class Object
Sealed Trait Enum, Union or Interface (see below)
Option[A] Nullable A
List[A] List of A
Set[A] List of A
Seq[A] List of A
Vector[A] List of A
A => B A and B
(A, B) Object with 2 fields _1 and _2
Either[A, B] Object with 2 nullable fields left and right
Map[A, B] List of Object with 2 fields key and value
ZIO[R, Nothing, A] A
ZIO[R, Throwable, A] Nullable A
Future[A] Nullable A
ZStream[R, Throwable, A] A (subscription) or List of A (query, mutation)
Json (from Circe (opens new window)) Json (custom scalar, need import caliban.interop.circe.json._)
Json (from play-json (opens new window)) Json (custom scalar, need import caliban.interop.play.json._)

See the Custom Types section to find out how to support your own types.

If you want Caliban to support other standard types, feel free to file an issue (opens new window) or even a PR.

# Enums, unions, interfaces

A sealed trait will be converted to a different GraphQL type depending on its content:

  • a sealed trait with only case objects will be converted to an ENUM
  • a sealed trait with only case classes will be converted to a UNION

GraphQL does not support empty objects, so in case a sealed trait mixes case classes and case objects, a union type will be created and the case objects will have a "fake" field named _ which is not queryable.

sealed trait Origin
+   (opens new window)

# Schema generation

A GraphQL schema will be derived automatically at compile-time (no reflection) from the types present in your resolver.

If you're more interested in the schema-first approach, it is also possible to generate the Scala code from a GraphQL schema file.

The table below shows how common Scala types are converted to GraphQL types.

Scala Type GraphQL Type
Boolean Boolean
Int Int
Float Float
Double Float
String String
java.util.UUID ID
Unit Unit (custom scalar)
Long Long (custom scalar)
BigInt BigInt (custom scalar)
BigDecimal BigDecimal (custom scalar)
java.time.Instant Instant (custom scalar)
java.time.LocalDate LocalDate (custom scalar)
java.time.LocalTime LocalTime (custom scalar)
java.time.LocalDateTime LocalDateTime (custom scalar)
java.time.OffsetDateTime OffsetDateTime (custom scalar)
java.time.ZonedDateTime ZonedDateTime (custom scalar)
Case Class Object
Sealed Trait Enum, Union or Interface (see below)
Option[A] Nullable A
List[A] List of A
Set[A] List of A
Seq[A] List of A
Vector[A] List of A
A => B A and B
(A, B) Object with 2 fields _1 and _2
Either[A, B] Object with 2 nullable fields left and right
Map[A, B] List of Object with 2 fields key and value
ZIO[R, Nothing, A] A
ZIO[R, Throwable, A] Nullable A
Future[A] Nullable A
ZStream[R, Throwable, A] A (subscription) or List of A (query, mutation)
Json (from Circe (opens new window)) Json (custom scalar, need import caliban.interop.circe.json._)
Json (from play-json (opens new window)) Json (custom scalar, need import caliban.interop.play.json._)

See the Custom Types section to find out how to support your own types.

If you want Caliban to support other standard types, feel free to file an issue (opens new window) or even a PR.

# Enums, unions, interfaces

A sealed trait will be converted to a different GraphQL type depending on its content:

  • a sealed trait with only case objects will be converted to an ENUM
  • a sealed trait with only case classes will be converted to a UNION

GraphQL does not support empty objects, so in case a sealed trait mixes case classes and case objects, a union type will be created and the case objects will have a "fake" field named _ which is not queryable.

sealed trait Origin
 object Origin {
   case object EARTH extends Origin
   case object MARS  extends Origin
@@ -160,7 +160,7 @@
 // or
 // implicit val queriesSchema: Schema[MyEnv, Queries] = Schema.gen
 // val api = graphQL(RootResolver(queries)) // it will infer MyEnv thanks to the instance above
-

# Annotations

Caliban supports a few annotations to enrich data types:

  • @GQLName("name") allows you to specify a different name for a data type or a field.
  • @GQLInputName("name") allows you to specify a different name for a data type used as an input (by default, the suffix Input is appended to the type name).
  • @GQLDescription("description") lets you provide a description for a data type or field. This description will be visible when your schema is introspected.
  • @GQLDeprecated("reason") allows deprecating a field or an enum value.
  • @GQLExcluded allows you to hide a field from the generated schema.
  • @GQLInterface to force a sealed trait generating an interface instead of a union.
  • @GQLDirective(directive: Directive) to add a directive to a field or type.
  • @GQLValueType(isScalar) forces a type to behave as a value type for derivation. Meaning that caliban will ignore the outer type and take the first case class parameter as the real type. If isScalar is true, it will generate a scalar named after the case class (default: false).
  • @GQLDefault("defaultValue") allows you to specify a default value for an input field using GraphQL syntax. The default value will be visible in your schema's SDL and during introspection.

# Java 8 Time types

Caliban provides implicit Schema types for the standard java.time types, by default these will use the +

# Subscriptions

All the fields of the subscription root case class MUST return ZStream or ? => ZStream objects.

The cats and monix interop modules also let you use fs2 Stream and monix Observable respectively.

# Annotations

Caliban supports a few annotations to enrich data types:

  • @GQLName("name") allows you to specify a different name for a data type or a field.
  • @GQLInputName("name") allows you to specify a different name for a data type used as an input (by default, the suffix Input is appended to the type name).
  • @GQLDescription("description") lets you provide a description for a data type or field. This description will be visible when your schema is introspected.
  • @GQLDeprecated("reason") allows deprecating a field or an enum value.
  • @GQLExcluded allows you to hide a field from the generated schema.
  • @GQLInterface to force a sealed trait generating an interface instead of a union.
  • @GQLDirective(directive: Directive) to add a directive to a field or type.
  • @GQLValueType(isScalar) forces a type to behave as a value type for derivation. Meaning that caliban will ignore the outer type and take the first case class parameter as the real type. If isScalar is true, it will generate a scalar named after the case class (default: false).
  • @GQLDefault("defaultValue") allows you to specify a default value for an input field using GraphQL syntax. The default value will be visible in your schema's SDL and during introspection.

# Java 8 Time types

Caliban provides implicit Schema types for the standard java.time types, by default these will use the ISO standard strings for serialization and deserialization. However, you can customize this behavior by using explicit constructor available under the ArgBuilder companion object. For instance, you can specify an instantEpoch to handle instants which are encoded using a Long from the standard java epoch time (January 1st 1970 00:00:00). @@ -207,6 +207,6 @@ →

- + diff --git a/docs/docs/server-codegen.html b/docs/docs/server-codegen.html index c8f30b21a..4254d7af1 100644 --- a/docs/docs/server-codegen.html +++ b/docs/docs/server-codegen.html @@ -8,7 +8,7 @@ - + @@ -129,6 +129,6 @@ →

- + diff --git a/docs/docs/stitching.html b/docs/docs/stitching.html index ee4b89d3d..0575221da 100644 --- a/docs/docs/stitching.html +++ b/docs/docs/stitching.html @@ -8,7 +8,7 @@ - + @@ -181,6 +181,6 @@ →

- + diff --git a/docs/docs/tools.html b/docs/docs/tools.html index 909e3a526..6c5171466 100644 --- a/docs/docs/tools.html +++ b/docs/docs/tools.html @@ -8,7 +8,7 @@ - + @@ -46,6 +46,6 @@ →

- + diff --git a/docs/faq/index.html b/docs/faq/index.html index cfa2c8e08..3070841b5 100644 --- a/docs/faq/index.html +++ b/docs/faq/index.html @@ -8,7 +8,7 @@ - + @@ -82,6 +82,6 @@ } }""")
- + diff --git a/docs/index.html b/docs/index.html index 8dbde86cc..2e11fd0c0 100644 --- a/docs/index.html +++ b/docs/index.html @@ -8,7 +8,7 @@ - + @@ -43,6 +43,6 @@

Get Started →

High performance

While all public interfaces are pure and immutable, the library's internals are optimized for speed.

Minimal boilerplate

No need to manually define schemas for every type in your API. Let the compiler handle the tedious work.

Excellent interoperability

Out-of-the-box support for major HTTP server libraries, effect types, JSON libraries, and more.

- + diff --git a/docs/resources/index.html b/docs/resources/index.html index 3742e0f6b..64978a669 100644 --- a/docs/resources/index.html +++ b/docs/resources/index.html @@ -8,7 +8,7 @@ - + @@ -38,6 +38,6 @@ Scaladoc (opens new window)

# Resources

# Talks

# Blog Articles

- +