New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

controllers.test.js

import Ember from 'ember';

const countObj = Ember.Object.extend({
	a: Ember.computed('src', function() {
    return 'a  ' + this.get('src').lastIndexOf('a');
  }),
  s: Ember.computed('src', function() {
    return 's  ' + this.get('src').lastIndexOf('s');
  })
});

export default Ember.Controller.extend({
  src: 'aasasasasasdasd',
  cnt: null,
  init() {
   this.set('cnt', countObj.create({ src: this.get('src')})); 
  },
  a: Ember.computed('src', function() {
    return 'a  ' + this.get('src').lastIndexOf('a');
  }),
  actions: {
    chang() {
     this.set('src', this.get('src') + this.get('src')); 
    }
  }
});

models.my-model.js

import Model from "ember-data/model";
import attr from "ember-data/attr";
import { belongsTo, hasMany } from "ember-data/relationships";

export default Model.extend({
  name: attr()
});

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
   this.route('test', { path: '/test' });
});

export default Router;

routes.test.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
   return this.get('store').get('my-model');
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

templates.test.hbs

Src

{{src}}
<br/>

Without Computed Object  <br/>{{a}}
 <br/>
<br/>
With Computed Object  <br/>
{{cnt.a}}
 <br/>
<br/>
{{cnt.s}}

<br/>

<button {{action "chang"}}>Change src </button>

twiddle.json

{
  "version": "0.13.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}