feat(FieldsConverter): DocumentArray return defined early TypeComposer if it exists, instead of generating new one

See src/__mocks__/languageSchema.js where type name `Language` is pre-defined via `convertSchemaToGraphQL(LanguageSchema, 'Language');`.
Otherwise genereted type may has different names for different models where it is used. By default, name for DocumentArray is `${ParentSchemaName}${ParentSchemaFieldName}`.

Author: nodkz

src/__mocks__/languagesSchema.js renamed to src/__mocks__/languageSchema.js

@@ -1,4 +1,5 @@
 import { Schema } from './mongooseCommon';
+import { convertSchemaToGraphQL } from '../fieldsConverter';
 
 // name: 'EnumLanguageName',
 // description: 'Language names (https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes)',
@@ -14,7 +15,7 @@ const enumLanguageSkill = {
   native: { description: 'since birth' },
 };
 
-const LanguagesSchema = new Schema(
+const LanguageSchema = new Schema(
   {
     ln: {
       type: String,
@@ -29,4 +30,8 @@ const LanguagesSchema = new Schema(
   }
 );
 
-export default LanguagesSchema;
+export default LanguageSchema;
+
+// Such way we can set Type name for Schema which is used in another schema.
+// Otherwise by default it will have name `${ParentSchemaName}${ParentSchemaFieldName}`
+convertSchemaToGraphQL(LanguageSchema, 'Language');

src/__mocks__/userModel.js

@@ -1,7 +1,7 @@
 import { mongoose, Schema } from './mongooseCommon';
 import ContactsSchema from './contactsSchema';
 import enumEmployment from './enumEmployment';
-import LanguagesSchema from './languagesSchema';
+import LanguageSchema from './languageSchema';
 
 const UserSchema = new Schema(
   {
@@ -65,7 +65,7 @@ const UserSchema = new Schema(
     },
 
     languages: {
-      type: [LanguagesSchema],
+      type: [LanguageSchema],
       default: [],
       description: 'Knowledge of languages',
     },

src/__tests__/fieldConverter-test.js

@@ -1,4 +1,4 @@
-/* eslint-disable no-unused-expressions */
+/* eslint-disable no-unused-expressions, no-template-curly-in-string */
 
 import { expect } from 'chai';
 import {
@@ -130,55 +130,49 @@ describe('fieldConverter', () => {
   });
 
   describe('arrayToGraphQL()', () => {
-    const skillsType = arrayToGraphQL(fields.skills);
-
     it('should produce GraphQLList', () => {
+      const skillsType = arrayToGraphQL(fields.skills);
       expect(skillsType).to.be.instanceof(GraphQLList);
     });
 
     it('should has string in ofType', () => {
+      const skillsType = arrayToGraphQL(fields.skills);
       expect(skillsType.ofType.name).to.equal('String');
     });
   });
 
   describe('enumToGraphQL()', () => {
-    const genderEnum = enumToGraphQL(fields.gender);
-
     it('should be instance of GraphQLEnumType', () => {
+      const genderEnum = enumToGraphQL(fields.gender);
       expect(genderEnum).be.instanceof(GraphQLEnumType);
     });
 
     it('should have type name `Enum${FieldName}`', () => {
+      const genderEnum = enumToGraphQL(fields.gender);
       expect(genderEnum.name).to.equal('EnumGender');
     });
 
     it('should pass all enum values to GQ type', () => {
+      const genderEnum = enumToGraphQL(fields.gender);
       expect(genderEnum._values.length).to.equal(fields.gender.enumValues.length);
       expect(genderEnum._values[0].value).to.equal(fields.gender.enumValues[0]);
     });
   });
 
   describe('embeddedToGraphQL()', () => {
-    const embeddedType = embeddedToGraphQL(fields.contacts);
-    const embeddedFields = embeddedType._typeConfig.fields();
-
     it('should set name to graphql type', () => {
-      expect(embeddedType.name).to.equal('Contacts');
+      const embeddedType = embeddedToGraphQL(fields.contacts);
+      expect(embeddedType.name).to.equal('UserContacts');
     });
 
     it('should have embedded fields', () => {
+      const embeddedType = embeddedToGraphQL(fields.contacts);
+      const embeddedFields = embeddedType._typeConfig.fields();
       expect(embeddedFields.email).to.be.ok;
-    });
-
-    it('should have embedded fields with MongoID type, except pseudoID', () => {
       expect(embeddedFields.locationId).to.be.ok;
       expect(embeddedFields._id).to.be.undefined;
     });
 
-    it('should skip pseudo mongoose _id field', () => {
-      expect(embeddedFields._id).to.be.undefined;
-    });
-
     it('should return null if subdocument is empty', async () => {
       const UserTC = composeWithMongoose(UserModel);
       const schema = new GraphQLSchema({
@@ -263,8 +257,9 @@ describe('fieldConverter', () => {
       expect(languagesType).to.be.instanceof(GraphQLList);
     });
 
-    it('should has Languages type in ofType', () => {
-      expect(languagesType.ofType.name).to.equal('Languages');
+    it('should has Language type in ofType', () => {
+      // see src/__mocks__/languageSchema.js where type name `Language` is defined
+      expect(languagesType.ofType.name).to.equal('Language');
     });
 
     it('should skip pseudo mongoose _id field in document', () => {

src/fieldsConverter.js

@@ -127,6 +127,11 @@ export function convertModelToGraphQL(
   model: MongooseModelT | MongoosePseudoModelT,
   typeName: string
 ): TypeComposer {
+  // if model already has generated TypeComposer early, then return it
+  if (model.schema && model.schema._gqcTypeComposer instanceof TypeComposer) {
+    return model.schema._gqcTypeComposer;
+  }
+
   if (!typeName) {
     throw new Error('You provide empty name for type. '
     + '`name` argument should be non-empty string.');