Handle possible afterSave exception (#4293)

* capture and log exceptions caused by afterFind

* Wording

* Consolidated promise chaining

* use logger instead of console

spec/CloudCode.spec.js

@@ -1076,6 +1076,19 @@ describe('Cloud Code', () => {
       });
   });
 
+  /**
+   * Verifies that an afterSave hook throwing an exception
+   * will not prevent a successful save response from being returned
+   */
+  it('should succeed on afterSave exception', (done) => {
+    Parse.Cloud.afterSave("AfterSaveTestClass", function () {
+      throw "Exception";
+    });
+    const AfterSaveTestClass = Parse.Object.extend('AfterSaveTestClass');
+    const obj = new AfterSaveTestClass();
+    obj.save().then(done, done.fail);
+  });
+
   describe('cloud jobs', () => {
     it('should define a job', (done) => {
       expect(() => {

src/RestWrite.js

@@ -13,6 +13,7 @@ var triggers = require('./triggers');
 var ClientSDK = require('./ClientSDK');
 import RestQuery from './RestQuery';
 import _         from 'lodash';
+import logger    from './logger';
 
 // query and data are both provided in REST API format. So data
 // types are encoded by plain old objects.
@@ -1121,7 +1122,10 @@ RestWrite.prototype.runAfterTrigger = function() {
   this.config.liveQueryController.onAfterSave(updatedObject.className, updatedObject, originalObject);
 
   // Run afterSave trigger
-  return triggers.maybeRunTrigger(triggers.Types.afterSave, this.auth, updatedObject, originalObject, this.config);
+  return triggers.maybeRunTrigger(triggers.Types.afterSave, this.auth, updatedObject, originalObject, this.config)
+    .catch(function(err) {
+      logger.warn('afterSave caught an error', err);
+    })
 };
 
 // A helper to figure out what location this operation happens at.