feat: Add not equal filter, add tests.

Author: vantreeseba

src/introspection/getFilterTypesFromData.js

@@ -1,4 +1,5 @@
 import {
+    GraphQLBoolean,
     GraphQLInputObjectType,
     GraphQLString,
     GraphQLInt,
@@ -29,6 +30,10 @@ const getRangeFiltersFromEntities = (entities) => {
             fields[`${fieldName}_gt`] = { type: fieldType };
             fields[`${fieldName}_gte`] = { type: fieldType };
         }
+
+        if (fieldType != GraphQLBoolean && fieldType != GraphQLList) {
+            fields[`${fieldName}_neq`] = { type: fieldType };
+        }
         return fields;
     }, {});
 };

src/resolver/Query/applyFilters.js

@@ -7,6 +7,12 @@ export default (entityData = [], filter = {}) => {
         Object.keys(filter)
             .filter((key) => key !== 'q')
             .forEach((key) => {
+                if (key.indexOf('_neq') !== -1) {
+                    // not equal to
+                    const realKey = key.replace(/(_neq)$/, '');
+                    items = items.filter((d) => d[realKey] != filter[key]);
+                    return;
+                }
                 if (key.indexOf('_lte') !== -1) {
                     // less than or equal
                     const realKey = key.replace(/(_lte)$/, '');

src/resolver/Query/applyFilters.spec.js

@@ -95,6 +95,19 @@ test('filters by value on each field using the related filter', () => {
     ]);
 });
 
+test('filters by not equals given fields', () => {
+    expect(applyFilters(data, { id_neq: 2 })).toEqual([
+        {
+            id: 1,
+            title: 'Lorem Ipsum',
+            user_id: 123,
+            views: 254,
+            tags: ['foo', 'bar'],
+        },
+        { id: 3, title: 'Sic Dolor amet', user_id: 123, views: 76, tags: [] },
+    ]);
+});
+
 test('filters by value range on each integer field using the related filters', () => {
     expect(applyFilters(data, { views_lt: 76 })).toEqual([
         {