feat(query-typegoose): Adds the ability to use discriminators (#1321)

* feat(query-typegoose): Adds the ability to use discriminators 

Fixes #1320

* fix: removes package.json

* Revert "fix: removes package.json"

This reverts commit cc5d821.

* fix: adds package-lock.json

* fix: corrects linting issues adds missing added package

* fix(query-typegoose): minor changes

* fix(query-typegoose): fixes linting (again)

* fix(query-typegoose): fixes conflict in package-lock.json

Co-authored-by: Scott Molinari <scott.molinari@m8a.io>

packages/query-typegoose/__tests__/__fixtures__/seeds.ts

@@ -1,7 +1,8 @@
 /* eslint-disable no-underscore-dangle,@typescript-eslint/no-unsafe-return */
 import { Connection } from 'mongoose';
-import { getModelForClass, DocumentType } from '@typegoose/typegoose';
+import { getModelForClass, DocumentType, getDiscriminatorModelForClass } from '@typegoose/typegoose';
 import { TestEntity } from './test.entity';
+import { TestDiscriminatedEntity } from './test-discriminated.entity';
 import { TestReference } from './test-reference.entity';
 
 export const TEST_ENTITIES: DocumentType<TestEntity>[] = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10].map(
@@ -14,6 +15,19 @@ export const TEST_ENTITIES: DocumentType<TestEntity>[] = [1, 2, 3, 4, 5, 6, 7, 8
     } as DocumentType<TestEntity>),
 );
 
+export const TEST_DISCRIMINATED_ENTITIES: DocumentType<TestDiscriminatedEntity>[] = [
+  11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
+].map(
+  (i) =>
+    ({
+      boolType: i % 2 === 0,
+      dateType: new Date(`2020-02-${i}`),
+      numberType: i,
+      stringType: `foo${i}`,
+      stringType2: `bar${i}`,
+    } as DocumentType<TestDiscriminatedEntity>),
+);
+
 export const TEST_REFERENCES: DocumentType<TestReference>[] = TEST_ENTITIES.reduce(
   (relations, te) => [
     ...relations,
@@ -30,14 +44,44 @@ export const TEST_REFERENCES: DocumentType<TestReference>[] = TEST_ENTITIES.redu
   [] as DocumentType<TestReference>[],
 );
 
+export const TEST_REFERENCES_FOR_DISCRIMINATES: DocumentType<TestReference>[] = TEST_DISCRIMINATED_ENTITIES.reduce(
+  (relations, tde) => [
+    ...relations,
+    {
+      referenceName: `${tde.stringType}-test-reference-1-one`,
+    } as DocumentType<TestReference>,
+    {
+      referenceName: `${tde.stringType}-test-reference-2-two`,
+    } as DocumentType<TestReference>,
+    {
+      referenceName: `${tde.stringType}-test-reference-3-three`,
+    } as DocumentType<TestReference>,
+  ],
+  [] as DocumentType<TestReference>[],
+);
+
 export const seed = async (connection: Connection): Promise<void> => {
   const TestEntityModel = getModelForClass(TestEntity, { existingConnection: connection });
   const TestReferencesModel = getModelForClass(TestReference, { existingConnection: connection });
+  const TestDiscriminatedModel = getDiscriminatorModelForClass(TestEntityModel, TestDiscriminatedEntity);
 
   const testEntities = await TestEntityModel.create(TEST_ENTITIES);
+  const testDiscriminatedEntities = await TestDiscriminatedModel.create(TEST_DISCRIMINATED_ENTITIES);
   const testReferences = await TestReferencesModel.create(TEST_REFERENCES);
+  const testReferencesForDiscriminates = await TestReferencesModel.create(TEST_REFERENCES_FOR_DISCRIMINATES);
+
   testEntities.forEach((te, index) => Object.assign(TEST_ENTITIES[index], te.toObject({ virtuals: true })));
+
+  testDiscriminatedEntities.forEach((tde, index) =>
+    Object.assign(TEST_DISCRIMINATED_ENTITIES[index], tde.toObject({ virtuals: true })),
+  );
+
   testReferences.forEach((tr, index) => Object.assign(TEST_REFERENCES[index], tr.toObject({ virtuals: true })));
+
+  testReferencesForDiscriminates.forEach((trfd, index) =>
+    Object.assign(TEST_REFERENCES_FOR_DISCRIMINATES[index], trfd.toObject({ virtuals: true })),
+  );
+
   await Promise.all(
     testEntities.map(async (te, index) => {
       const references = testReferences.filter((tr: TestReference) => tr.referenceName.includes(`${te.stringType}-`));
@@ -53,4 +97,22 @@ export const seed = async (connection: Connection): Promise<void> => {
       );
     }),
   );
+
+  await Promise.all(
+    testDiscriminatedEntities.map(async (tde, index) => {
+      const references = testReferencesForDiscriminates.filter((trfd: TestReference) =>
+        trfd.referenceName.includes(`${tde.stringType}-`),
+      );
+      TEST_DISCRIMINATED_ENTITIES[index].testReference = references[0]._id;
+      TEST_DISCRIMINATED_ENTITIES[index].testReferences = references.map((r) => r._id);
+      await tde.updateOne({ $set: { testReferences: references.map((r) => r._id), testReference: references[0]._id } });
+      await Promise.all(
+        references.map((r) => {
+          // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+          TEST_REFERENCES_FOR_DISCRIMINATES.find((tr) => tr._id.toString() === r._id.toString())!.testEntity = tde._id;
+          return r.updateOne({ $set: { testEntity: tde._id } });
+        }),
+      );
+    }),
+  );
 };

packages/query-typegoose/__tests__/__fixtures__/test-discriminated.entity.ts

@@ -0,0 +1,7 @@
+import { prop } from '@typegoose/typegoose';
+import { TestEntity } from './test.entity';
+
+export class TestDiscriminatedEntity extends TestEntity {
+  @prop({ required: true })
+  stringType2!: string;
+}