New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  pillar: 'foo',
  data: Ember.computed('pillar', function() {
  	const dataPromise = Ember.ObjectProxy.extend(Ember.PromiseProxyMixin);
    
    return dataPromise.create({
    	promise: new Ember.RSVP.Promise((res) => {
        Ember.run.later(() => {
          res({pillar: this.get('pillar')});
        }, 5000);
    	})
    });
  }),
  
  actions: {
		updatePillar(newPillar) {
			this.set('pillar', newPillar);
		}
	}
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<button {{action "updatePillar" "bar"}}>change pillar</button>
<br>
<br>
{{outlet}}
data: {{if data.isFulfilled (concat 'resolved pillar: ' data.pillar) 'loading pillar...'}}
<br>
<br>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}