Prevent crashing when no items provided (#141)

src/helpers.js

@@ -247,6 +247,10 @@ export const index = function (items, fields) {
 
   let i = 1;
 
+  fields.forEach((field) => {
+    facets['data'][field] = Object.create(null);
+  });
+
   items && items.map((item) => {
     if (!item['_id']) {
       item['_id'] = i;
@@ -258,15 +262,10 @@ export const index = function (items, fields) {
 
   items && items.map((item) => {
     fields.forEach((field) => {
-      //if (!item || !item[field]) {
       if (!item) {
         return;
       }
 
-      if (!facets['data'][field]) {
-        facets['data'][field] = Object.create(null);
-      }
-
       if (Array.isArray(item[field])) {
         item[field].forEach((v) => {
           if (!item[field]) {

tests/searchSpec.js

@@ -65,6 +65,25 @@ describe('search', function () {
     done();
   });
 
+  it('searches no items with filters and query', function test(done) {
+    const itemsjs = itemsJS([], configuration);
+
+    const result = itemsjs.search({
+      filters: {
+        tags: ['a'],
+        category: ['drama'],
+      },
+      query: 'comedy',
+    });
+
+    assert.equal(result.data.items.length, 0);
+    assert.equal(result.data.aggregations.in_cinema.buckets.length, 0);
+    assert.equal(result.data.aggregations.category.buckets.length, 0);
+    assert.equal(result.data.aggregations.year.buckets.length, 0);
+
+    done();
+  });
+
   it('searches with two filters', function test(done) {
     const itemsjs = itemsJS(items, configuration);
 
@@ -244,7 +263,7 @@ describe('search', function () {
     } catch (err) {
       assert.equal(
         err.message,
-        '"query" and "filter" options are not working once native search is disabled',
+        '"query" and "filter" options are not working once native search is disabled'
       );
     }