Testing Sorted Properties

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  
  sortProperties: ['position'],
  sorted: Ember.computed.sort('model', 'sortProperties'),
  
  actions: {
    upPosition(m) {
      m.set('position', m.get('position') + 1);
    }
  }
});

application.route.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return [
      Ember.Object.create({ 'title': "A", 'position': 1 }),
      Ember.Object.create({ 'title': "B", 'position': 2 }),
      Ember.Object.create({ 'title': "D", 'position': 4 }),
      Ember.Object.create({ 'title': "C", 'position': 3 })
    ];
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{#each sorted as |m|}}
  {{m.title}} - {{m.position}} 
  <button {{action 'upPosition' m}}>Up</button><br>
{{/each}}

twiddle.json

{
  "version": "0.4.11",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.0.1/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.0.1/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.0.1/ember-template-compiler.js"
  }
}