toml: cannot decode tables into maps

[gechandesu]

Describe the bug

The subject.

Reproduction Steps

module main

import toml

struct Item {
	name string
}

struct Doc {
	items map[string]Item
}

fn main() {
	doc := Doc{
		items: {
			'first':  Item{
				name: 'first one'
			}
			'second': Item{
				name: 'second one'
			}
		}
	}
	encoded := toml.encode[Doc](doc)
	decoded := toml.decode[Doc](encoded)!

	assert decoded == doc
}

Expected Behavior

Assertion passed.

Current Behavior

decoded.items is empty:

~ $ v run toml_issue_.v
toml_issue_.v:27: FAIL: fn main.main: assert decoded == doc
   left value: decoded = Doc{
    items: {}
}
  right value: doc = Doc{
    items: {'first': Item{
        name: 'first one'
    }, 'second': Item{
        name: 'second one'
    }}
}
V panic: Assertion failed...
v hash: 97c6cd0
/tmp/v_1000/toml_issue_.01JAX6P20BN5TX8R9NGB7F3229.tmp.c:10411: at _v_panic: Backtrace
/tmp/v_1000/toml_issue_.01JAX6P20BN5TX8R9NGB7F3229.tmp.c:30554: by main__main
/tmp/v_1000/toml_issue_.01JAX6P20BN5TX8R9NGB7F3229.tmp.c:30873: by main

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.8 97c6cd0

Environment details (OS name and version, etc.)

V full version: V 0.4.8 5ec9bb5.97c6cd0
OS: linux, Linux version 6.6.8-arch1-1 (linux@archlinux) (gcc (GCC) 13.2.1 20230801, GNU ld (GNU Binutils) 2.41.0) #1 SMP PREEMPT_DYNAMIC Thu, 21 Dec 2023 19:01:01 +0000
Processor: 16 cpus, 64bit, little endian, 12th Gen Intel(R) Core(TM) i5-1240P

getwd: /home/ge
vexe: /home/ge/.vlang/v
vexe mtime: 2024-10-23 16:44:23

vroot: OK, value: /home/ge/.vlang
VMODULES: OK, value: /home/ge/.vmodules
VTMP: OK, value: /tmp/v_1000

Git version: git version 2.46.1
Git vroot status: weekly.2024.43-20-g97c6cd09
.git/config present: true

CC version: cc (GCC) 14.2.1 20240910
thirdparty/tcc status: thirdparty-linux-amd64 0134e9b9

Note

You can use the 👍 reaction to increase the issue's priority for developers.

Please note that only the 👍 reaction to the issue itself counts as a vote.
Other reactions and those to comments will not be taken into account.

_{Huly®: V_0.6-21083}

[gechandesu]

The workaround is parsing by hand using from_toml() method.

Code

module main

import maps
import toml

struct Item {
	name string
}

struct Doc {
mut:
	items map[string]Item
}

fn (mut d Doc) from_toml(doc toml.Any) {
	items := doc.as_map()['items'] or { toml.Any(map[string]toml.Any{}) }.as_map()
	for key, val in items {
		item := {
			key: Item{
				name: val.as_map()['name'] or { toml.Any{} }.string()
			}
		}
		maps.merge_in_place(mut d.items, item)
	}
}

fn main() {
	doc := Doc{
		items: {
			'first':  Item{
				name: 'first one'
			}
			'second': Item{
				name: 'second one'
			}
		}
	}
	encoded := toml.encode[Doc](doc)
	decoded := toml.decode[Doc](encoded)!

	assert decoded == doc
}