javascript - Why does Ember Data think save() is failing when it’s not? -

i have ember model saving database. when call

model.save().then(function () {   alert('everything worked.'); }, function () {   alert('save failed.'); }); 

the record persists database, network request api call saving responds status code of 200 , body of

{   "id": 11,   "send_date": "2014-12-01t23:20:31.821z",   "expiration_date": "2014-12-08t06:00:00.000z",   "message": "what happening here",   "url": null,   "feature_id": null } 

and no errors appear in console. works perfectly, except rejection handler alert('save failed.') called every time. success handler never called. why?

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edit

the reason passed fail handler error:

column: 22 line: 11256 message: "undefined not object (evaluating 'factory.typekey')" sourceurl: "http://localhost:8080/bower_components/ember-data/ember-data.js" stack: "modelfor@http://localhost:8080/bower_components/ember-data/ember-data.js:11256:22         recordforid@http://localhost:8080/bower_components/ember-data/ember-data.js:10727:33         deserializerecordid@http://localhost:8080/bower_components/ember-data/ember-data.js:11692:38         http://localhost:8080/bower_components/ember-data/ember-data.js:11670:30         http://localhost:8080/bower_components/ember-data/ember-data.js:9456:24         http://localhost:8080/bower_components/ember-data/ember-data.js:5295:37         http://localhost:8080/bower_components/ember/ember.js:14899:24         foreach@http://localhost:8080/bower_components/ember/ember.js:14741:18         foreach@http://localhost:8080/bower_components/ember/ember.js:14897:21         mapforeach@http://localhost:8080/bower_components/ember-data/ember-data.js:5302:29         eachrelationship@http://localhost:8080/bower_components/ember-data/ember-data.js:9455:49         normalizerelationships@http://localhost:8080/bower_components/ember-data/ember-data.js:11666:28         didsaverecord@http://localhost:8080/bower_components/ember-data/ember-data.js:11125:40         http://localhost:8080/bower_components/ember-data/ember-data.js:11905:28         trycatch@http://localhost:8080/bower_components/ember/ember.js:45817:24         invokecallback@http://localhost:8080/bower_components/ember/ember.js:45829:25         publish@http://localhost:8080/bower_components/ember/ember.js:45800:25         http://localhost:8080/bower_components/ember/ember.js:29071:17         invoke@http://localhost:8080/bower_components/ember/ember.js:634:22         flush@http://localhost:8080/bower_components/ember/ember.js:684:21         end@http://localhost:8080/bower_components/ember/ember.js:147:32         run@http://localhost:8080/bower_components/ember/ember.js:202:23         apply@http://localhost:8080/bower_components/ember/ember.js:18384:31         run@http://localhost:8080/bower_components/ember/ember.js:17001:19         success@http://localhost:8080/bower_components/ember-data/ember-data.js:1879:24         fire@http://localhost:8080/bower_components/jquery/jquery.js:2913:35         firewith@http://localhost:8080/bower_components/jquery/jquery.js:3025:11         done@http://localhost:8080/bower_components/jquery/jquery.js:7400:25         http://localhost:8080/bower_components/jquery/jquery.js:7822:17" 

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edit

i fixed error removing belongsto relationship ember data model. relationship feature going implement later, i'm removing now. guess cross bridge when it.