Fields on _operators are lost on child resolvers when using discriminators

src/__tests__/integration-discriminators-test.ts

@@ -11,10 +11,13 @@ afterAll(() => mongoose.disconnect());
 describe('#78 Mongoose and Discriminators', () => {
   const options = { discriminatorKey: 'kind' };
 
-  const eventSchema = new mongoose.Schema({ refId: String }, options);
+  const eventSchema = new mongoose.Schema(
+    { refId: String, name: { type: String, index: true } },
+    options
+  );
   const Event = mongoose.model('Event', eventSchema);
 
-  const clickedLinkSchema = new mongoose.Schema({ url: String });
+  const clickedLinkSchema = new mongoose.Schema({ url: { type: String, index: true } }, options);
   const ClickedLinkEvent = Event.discriminator('ClickedLinkEvent', clickedLinkSchema);
 
   const EventTC = composeWithMongooseDiscriminators(Event);
@@ -23,13 +26,48 @@ describe('#78 Mongoose and Discriminators', () => {
   afterAll(() => Event.deleteMany({}));
 
   it('creating Types from models', () => {
-    expect(EventTC.getFieldNames()).toEqual(['_id', 'kind', 'refId']);
-    expect(ClickedLinkEventTC.getFieldNames()).toEqual(['_id', 'kind', 'refId', 'url']);
+    expect(EventTC.getFieldNames()).toEqual(['_id', 'kind', 'refId', 'name']);
+    expect(ClickedLinkEventTC.getFieldNames()).toEqual(['_id', 'kind', 'refId', 'name', 'url']);
   });
 
-  it('manually override resolver output type for findMany', async () => {
+  it('perform filter operation on a child model', async () => {
     // let's check graphql response
+    await Event.deleteMany({});
+    await Event.create({ refId: 'aaa', name: 'aName' });
+    await Event.create({ refId: 'bbb', name: 'bName' });
+    await ClickedLinkEvent.create({ refId: 'ccc', name: 'cName', url: 'url1' });
+    await ClickedLinkEvent.create({ refId: 'ddd', name: 'dName', url: 'url2' });
+
+    schemaComposer.Query.addFields({
+      clickedLinkEventFindMany: ClickedLinkEventTC.getResolver('findMany'),
+    });
+
+    const schema = schemaComposer.buildSchema();
 
+    const res = await graphql.graphql(
+      schema,
+      `{
+        clickedLinkEventFindMany( filter: { AND: [ { _operators: { url: { in: [ "url1", "url2" ] } } }, { name: "dName" } ] }) {
+          __typename
+          refId
+          name
+          url
+        }
+      }`
+    );
+
+    expect(res).toEqual({
+      data: {
+        clickedLinkEventFindMany: [
+          { __typename: 'ClickedLinkEvent', refId: 'ddd', name: 'dName', url: 'url2' },
+        ],
+      },
+    });
+  });
+
+  it('manually override resolver output type for findMany', async () => {
+    // let's check graphql response
+    await Event.deleteMany({});
     await Event.create({ refId: 'aaa' });
     await Event.create({ refId: 'bbb' });
     await ClickedLinkEvent.create({ refId: 'ccc', url: 'url1' });

src/discriminators/__tests__/prepareChildResolvers-test.ts

@@ -1,6 +1,7 @@
 import { schemaComposer, ObjectTypeComposer } from 'graphql-compose';
 import { composeWithMongooseDiscriminators } from '../../composeWithMongooseDiscriminators';
 import { getCharacterModels } from '../__mocks__/characterModels';
+import { OPERATORS_FIELDNAME } from '../../resolvers/helpers/filterOperators';
 
 const DKeyFieldName = 'type';
 const { CharacterModel, PersonModel } = getCharacterModels(DKeyFieldName);
@@ -116,5 +117,22 @@ describe('prepareChildResolvers()', () => {
         PersonTC.getResolver('createOne').getArgITC('record').getFieldType('kind')
       );
     });
+
+    it('should not copy base _operations to child', () => {
+      expect(
+        baseDTC
+          .getResolver('findMany')
+          .getArgITC('filter')
+          .getField(OPERATORS_FIELDNAME)
+          .type.getTypeName()
+      ).toEqual('FilterFindManyCharacterOperatorsInput');
+
+      expect(
+        PersonTC.getResolver('findMany')
+          .getArgITC('filter')
+          .getField(OPERATORS_FIELDNAME)
+          .type.getTypeName()
+      ).toEqual('FilterFindManyPersonOperatorsInput');
+    });
   });
 });

src/discriminators/prepareChildResolvers.ts

@@ -4,6 +4,7 @@ import {
   DiscriminatorTypeComposer,
 } from './DiscriminatorTypeComposer';
 import { resolverFactory } from '../resolvers';
+import { OPERATORS_FIELDNAME } from '../resolvers/helpers/filterOperators';
 
 // set the DKey as a query on filter, also project it
 // Also look at it like setting for filters, makes sure to limit
@@ -85,7 +86,10 @@ function copyResolverArgTypes<TSource, TContext>(
         const baseResolverArgTCFields = baseResolverArgTC.getFieldNames();
 
         for (const baseArgField of baseResolverArgTCFields) {
-          if (childResolverArgTC.hasField(baseArgField) && baseArgField !== '_id') {
+          if (
+            childResolverArgTC.hasField(baseArgField) &&
+            ['_id', OPERATORS_FIELDNAME, 'OR', 'AND'].indexOf(baseArgField) === -1
+          ) {
             childResolverArgTC.extendField(baseArgField, {
               type: baseResolverArgTC.getField(baseArgField).type,
             });