save promise alias

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  isSaving: Ember.computed.alias('promise.isPending'),
  
  reason: Ember.computed.alias('promise.reason'),
  
  bork() { alert('thing borked!'); },
  
  actions: {
    saveAThing() {
      let thing = this.store.createRecord('thing');
      let saveThing = thing.save();
      thing.on('becameError', () => { this.bork() } );
      this.set('promise', saveThing);
    }
  }
});

models.thing.js

import Model from 'ember-data/model';

export default Model.extend({
  
  //becameError() {
  //  alert('i borked!');
  //}
  
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
Thing is saving: {{isSaving}}

<br>
<br>

{{#if reason}}
  Thing failed: {{reason}}
{{/if}}
<br>
<br>
<button {{action "saveAThing"}}>Save</button>

twiddle.json

{
  "version": "0.8.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  }
}