fix: revert "Null fields in mongo return sub fields". It brokes aliases and old behavior was quite expensive with .toObject call.

Also if we take a look at `toObject` implementations then we can find that it calls minimize under the hood. So if you need the old behavior, just write your custom resolver for the field which you want to minimize.

Related: #7

Author: nodkz

src/__tests__/integration-test.ts

@@ -12,7 +12,7 @@ describe('integration tests', () => {
   });
 
   describe('check sub-documents', () => {
-    it('should return null if sub-document is empty', async () => {
+    it('should return subDoc fields even subDoc is empty itself', async () => {
       const UserTC = composeWithMongoose(UserModel);
       schemaComposer.Query.addFields({
         user: UserTC.getResolver('findById'),
@@ -41,11 +41,14 @@ describe('integration tests', () => {
 
       expect(result.data.user).toEqual({
         name: 'Test empty subDoc',
-        subDoc: null,
+        subDoc: {
+          field1: null,
+          field2: { field21: null },
+        },
       });
     });
 
-    it('should return sub-document if it is non-empty', async () => {
+    it('should return subDoc fields if it is non-empty', async () => {
       const UserTC = composeWithMongoose(UserModel);
       // UserTC.get('$findById.subDoc').extendField('field2', {
       //   resolve: (source) => {

src/fieldsConverter.ts

@@ -193,20 +193,6 @@ export function convertModelToGraphQL<TDoc extends Document, TContext>(
       if (!graphqlFields[fieldName].extensions) graphqlFields[fieldName].extensions = {};
       (graphqlFields as any)[fieldName].extensions.defaultValue = mongooseField?.defaultValue;
     }
-
-    if (deriveComplexType(mongooseField) === ComplexTypes.EMBEDDED) {
-      // https://github.com/nodkz/graphql-compose-mongoose/issues/7
-      graphqlFields[fieldName].resolve = (source) => {
-        if (source) {
-          if (source.toObject) {
-            const obj = source.toObject();
-            return obj[fieldName];
-          }
-          return source[fieldName];
-        }
-        return null;
-      };
-    }
   });
 
   typeComposer.addFields(graphqlFields);