Fixed a bug affecting updates to nested pointers (#7392)

* Fixed a bug affecting updates to nested pointers
  Also created unit tests

* Marked the regression test for #7391 as pending for postgre
  The issue is not fixed yet
Use cont instead of var

Author: mstniy

spec/ParseAPI.spec.js

@@ -646,6 +646,28 @@ describe('miscellaneous', function () {
       });
   });
 
+  it_only_db('mongo')('pointer reassign on nested fields is working properly (#7391)', async () => {
+    const obj = new Parse.Object('GameScore'); // This object will include nested pointers
+    const ptr1 = new Parse.Object('GameScore');
+    await ptr1.save(); // Obtain a unique id
+    const ptr2 = new Parse.Object('GameScore');
+    await ptr2.save(); // Obtain a unique id
+    obj.set('data', { ptr: ptr1 });
+    await obj.save();
+
+    obj.set('data.ptr', ptr2);
+    await obj.save();
+
+    const obj2 = await new Parse.Query('GameScore').get(obj.id);
+    expect(obj2.get('data').ptr.id).toBe(ptr2.id);
+
+    const query = new Parse.Query('GameScore');
+    query.equalTo('data.ptr', ptr2);
+    const res = await query.find();
+    expect(res.length).toBe(1);
+    expect(res[0].get('data').ptr.id).toBe(ptr2.id);
+  });
+
   it('test afterSave get full object on create and update', function (done) {
     let triggerTime = 0;
     // Register a mock beforeSave hook

src/Adapters/Storage/Mongo/MongoTransform.js

@@ -99,7 +99,10 @@ const transformKeyValueForUpdate = (className, restKey, restValue, parseFormatSc
 
   if (
     (parseFormatSchema.fields[key] && parseFormatSchema.fields[key].type === 'Pointer') ||
-    (!parseFormatSchema.fields[key] && restValue && restValue.__type == 'Pointer')
+    (!key.includes('.') &&
+      !parseFormatSchema.fields[key] &&
+      restValue &&
+      restValue.__type == 'Pointer') // Do not use the _p_ prefix for pointers inside nested documents
   ) {
     key = '_p_' + key;
   }
@@ -305,7 +308,10 @@ function transformQueryKeyValue(className, key, value, schema, count = false) {
     schema && schema.fields[key] && schema.fields[key].type === 'Pointer';
 
   const field = schema && schema.fields[key];
-  if (expectedTypeIsPointer || (!schema && value && value.__type === 'Pointer')) {
+  if (
+    expectedTypeIsPointer ||
+    (!schema && !key.includes('.') && value && value.__type === 'Pointer')
+  ) {
     key = '_p_' + key;
   }
 
@@ -326,8 +332,11 @@ function transformQueryKeyValue(className, key, value, schema, count = false) {
   }
 
   // Handle atomic values
-  if (transformTopLevelAtom(value) !== CannotTransform) {
-    return { key, value: transformTopLevelAtom(value) };
+  const transformRes = key.includes('.')
+    ? transformInteriorAtom(value)
+    : transformTopLevelAtom(value);
+  if (transformRes !== CannotTransform) {
+    return { key, value: transformRes };
   } else {
     throw new Parse.Error(
       Parse.Error.INVALID_JSON,