New Twiddle

application.controller.js

import Ember from 'ember';

const {
  Controller,
  computed,
  get,
  set,
  RSVP,
  ArrayProxy,
  PromiseProxyMixin,
  isArray
} = Ember;

export default Controller.extend({
  appName:'Ember Twiddle',
  letters: null,
  
  reversed: computed('[email protected]', function() {  
    return this.get('letters').sortBy('name');
  }),
  
  actions: {
    alterRecords() {
      if (get(records[1], 'name') === 'a') {
        set(records[1], 'name', 'd');
      } else {
        set(records[1], 'name', 'a');
      }
    }
  },
  
  init() {
    this._super();
    this.letters = PromiseArray.create({
      promise: RSVP.resolve(records)
    });
  }
  
});

const records = [
  { id: '001',
    name: 'c',
    type: 'letter' },
  { id: '002',
   name: 'a',
   type: 'letter' },
  { id: '003',
   name: 'b',
   type: 'letter' }
  ];

const PromiseArray = ArrayProxy.extend(PromiseProxyMixin);

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>
<table>
  <thead>
    <tr>
      <th>ID</th><th>name</th><th>index</th>
    </tr>
  </thead>
  <tbody>
  {{#each reversed as |letter index|}}
    <tr>
    <td>{{letter.id}}</td><td>{{letter.name}}</td><td>{{index}}</td>
    </tr>
  {{/each}}
  </tbody>
</table>
<br>
<br>
<button {{action "alterRecords"}}>Alter 002</button>

models.letter.js

import DS from 'ember-data';

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

twiddle.json

{
  "version": "0.5.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}