fix(beforeSave/afterSave): Return value instead of Parse.Op for nested fields (#7005)

* fix(beforeSave): Return value instead of Parse.Op

* afterSave test

* Improve Tests

* Fixed postgres test by saveArgumentsByValue

spec/CloudCode.spec.js

@@ -1480,17 +1480,41 @@ describe('Cloud Code', () => {
   });
 
   it('beforeSave should not sanitize database', async done => {
+    const { adapter } = Config.get(Parse.applicationId).database;
+    const spy = spyOn(adapter, 'findOneAndUpdate').and.callThrough();
+    spy.calls.saveArgumentsByValue();
+
     let count = 0;
-    Parse.Cloud.beforeSave('CloudIncrementNested', () => {
+    Parse.Cloud.beforeSave('CloudIncrementNested', req => {
       count += 1;
+      req.object.set('foo', 'baz');
+      expect(typeof req.object.get('objectField').number).toBe('number');
+    });
+
+    Parse.Cloud.afterSave('CloudIncrementNested', req => {
+      expect(typeof req.object.get('objectField').number).toBe('number');
     });
 
     const obj = new Parse.Object('CloudIncrementNested');
     obj.set('objectField', { number: 5 });
+    obj.set('foo', 'bar');
     await obj.save();
 
     obj.increment('objectField.number', 10);
     await obj.save();
+
+    const [
+      ,
+      ,
+      ,
+      /* className */ /* schema */ /* query */ update,
+    ] = adapter.findOneAndUpdate.calls.first().args;
+    expect(update).toEqual({
+      'objectField.number': { __op: 'Increment', amount: 10 },
+      foo: 'baz',
+      updatedAt: obj.updatedAt.toISOString(),
+    });
+
     count === 2 ? done() : fail();
   });
 

src/RestWrite.js

@@ -1558,15 +1558,19 @@ RestWrite.prototype.buildUpdatedObject = function (extraData) {
   const updatedObject = triggers.inflate(extraData, this.originalData);
   Object.keys(this.data).reduce(function (data, key) {
     if (key.indexOf('.') > 0) {
-      // subdocument key with dot notation ('x.y':v => 'x':{'y':v})
-      const splittedKey = key.split('.');
-      const parentProp = splittedKey[0];
-      let parentVal = updatedObject.get(parentProp);
-      if (typeof parentVal !== 'object') {
-        parentVal = {};
+      if (typeof data[key].__op === 'string') {
+        updatedObject.set(key, data[key]);
+      } else {
+        // subdocument key with dot notation { 'x.y': v } => { 'x': { 'y' : v } })
+        const splittedKey = key.split('.');
+        const parentProp = splittedKey[0];
+        let parentVal = updatedObject.get(parentProp);
+        if (typeof parentVal !== 'object') {
+          parentVal = {};
+        }
+        parentVal[splittedKey[1]] = data[key];
+        updatedObject.set(parentProp, parentVal);
       }
-      parentVal[splittedKey[1]] = data[key];
-      updatedObject.set(parentProp, parentVal);
       delete data[key];
     }
     return data;