Make sure the className is correct for results on unknown relations

src/ParseQuery.js

@@ -261,24 +261,27 @@ export default class ParseQuery {
   find(options?: FullOptions): ParsePromise {
     options = options || {};
 
-    var findOptions = {};
+    let findOptions = {};
     if (options.hasOwnProperty('useMasterKey')) {
       findOptions.useMasterKey = options.useMasterKey;
     }
     if (options.hasOwnProperty('sessionToken')) {
       findOptions.sessionToken = options.sessionToken;
     }
 
-    var controller = CoreManager.getQueryController();
+    let controller = CoreManager.getQueryController();
 
     return controller.find(
       this.className,
       this.toJSON(),
       findOptions
     ).then((response) => {
       return response.results.map((data) => {
+        // In cases of relations, the server may send back a className
+        // on the top level of the payload
+        let override = response.className || this.className;
         if (!data.className) {
-          data.className = this.className;
+          data.className = override;
         }
         return ParseObject.fromJSON(data);
       });

src/__tests__/ParseQuery-test.js

@@ -1298,4 +1298,41 @@ describe('ParseQuery', () => {
     q = new ParseQuery('User');
     expect(q.className).toBe('User');
   });
+
+  it('does not override the className if it comes from the server', asyncHelper((done) => {
+    CoreManager.setQueryController({
+      find(className, params, options) {
+        return ParsePromise.as({
+          results: [
+            { className: 'Product', objectId: 'P40', name: 'Product 40' },
+          ]
+        });
+      }
+    });
+
+    var q = new ParseQuery('Item');
+    q.find().then((results) => {
+      expect(results[0].className).toBe('Product');
+      done();
+    });
+  }));
+
+  it('can override the className with a name from the server', asyncHelper((done) => {
+    CoreManager.setQueryController({
+      find(className, params, options) {
+        return ParsePromise.as({
+          results: [
+            { objectId: 'P41', name: 'Product 41' },
+          ],
+          className: 'Product'
+        });
+      }
+    });
+
+    var q = new ParseQuery('Item');
+    q.find().then((results) => {
+      expect(results[0].className).toBe('Product');
+      done();
+    });
+  }));
 });