The 'beforeSave' trigger breaks the dot notation for subdocuments (cf #567) (#3912)

* The 'beforeSave' trigger breaks requests using the dot notation for subdocuments (cf #567)

* Convert 'var' to 'let' / 'const'

* Convert 'var' to 'const'

spec/rest.spec.js

@@ -54,6 +54,12 @@ describe('rest create', () => {
 
   it('handles object and subdocument', done => {
     const obj = { subdoc: {foo: 'bar', wu: 'tan'} };
+
+    Parse.Cloud.beforeSave('MyClass', function(req, res) {
+      // this beforeSave trigger should do nothing but can mess with the object
+      res.success();
+    });
+
     rest.create(config, auth.nobody(config), 'MyClass', obj)
     .then(() => database.adapter.find('MyClass', { fields: {} }, {}, {}))
     .then(results => {
@@ -64,7 +70,7 @@ describe('rest create', () => {
       expect(mob.subdoc.wu).toBe('tan');
       expect(typeof mob.objectId).toEqual('string');
       const obj = { 'subdoc.wu': 'clan' };
-      return rest.update(config, auth.nobody(config), 'MyClass', { objectId: mob.objectId }, obj)
+      return rest.update(config, auth.nobody(config), 'MyClass', { objectId: mob.objectId }, obj);
     })
     .then(() => database.adapter.find('MyClass', { fields: {} }, {}, {}))
     .then(results => {

src/RestWrite.js

@@ -153,12 +153,11 @@ RestWrite.prototype.runBeforeTrigger = function() {
   }
 
   let originalObject = null;
-  const updatedObject = triggers.inflate(extraData, this.originalData);
+  const updatedObject = this.buildUpdatedObject(extraData);
   if (this.query && this.query.objectId) {
     // This is an update for existing object.
     originalObject = triggers.inflate(extraData, this.originalData);
   }
-  updatedObject.set(this.sanitizedData());
 
   return Promise.resolve().then(() => {
     return triggers.maybeRunTrigger(triggers.Types.beforeSave, this.auth, updatedObject, originalObject, this.config);
@@ -1068,8 +1067,7 @@ RestWrite.prototype.runAfterTrigger = function() {
 
   // Build the inflated object, different from beforeSave, originalData is not empty
   // since developers can change data in the beforeSave.
-  const updatedObject = triggers.inflate(extraData, this.originalData);
-  updatedObject.set(this.sanitizedData());
+  const updatedObject = this.buildUpdatedObject(extraData);
   updatedObject._handleSaveResponse(this.response.response, this.response.status || 200);
 
   // Notifiy LiveQueryServer if possible
@@ -1104,6 +1102,29 @@ RestWrite.prototype.sanitizedData = function() {
   return Parse._decode(undefined, data);
 }
 
+// Returns an updated copy of the object
+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 = {};
+      }
+      parentVal[splittedKey[1]] = data[key];
+      updatedObject.set(parentProp, parentVal);
+      delete data[key];
+    }
+    return data;
+  }, deepcopy(this.data));
+
+  updatedObject.set(this.sanitizedData());
+  return updatedObject;
+};
+
 RestWrite.prototype.cleanUserAuthData = function() {
   if (this.response && this.response.response && this.className === '_User') {
     const user = this.response.response;