canary-sort-fix

application.controller.js

import Ember from 'ember';

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

application.route.js

import Ember from 'ember';

var MyObject = Ember.Object.extend({
  sortedItems: Ember.computed.sort('items', 'sortProps')
});

var items = Ember.A([
  { name: 'A', count: 1 },
  { name: 'A', count: 1, thing: 4, id: 1 },
  { name: 'B', count: 2 },
  { name: 'B', count: 2, thing: 3, id: 2 },
  { name: 'C', count: 3 },
  { name: 'C', count: 3, thing: 2, id: 3 },
  { name: 'D', count: 4 },
  { name: 'D', count: 4, thing: 1, id: 4 }
]);
var aSortProps = Ember.A(['name:desc', 'count']);
var bSortProps = Ember.A(['count:desc', 'thing']);

var model = Ember.Object.create({
  name: 'Hello',
  a: MyObject.create({
    sortProps: aSortProps,
    items: items
  }),
  b: MyObject.create({
    sortProps: bSortProps,
    items: items
  }),
  aDidChange: Ember.observer('a.sortedItems.[]', function () {
    console.log('a changed');
  });
});

export default Ember.Route.extend({
  model() {
    return model;
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{model.name}}
{{#each model.a.items as |item|}}
  <div>{{item.name}} {{item.count}}</div>
{{/each}}

{{#each model.a.sortedItems as |item|}}
  <div>{{item.name}} {{item.count}}</div>
{{/each}}

<br>
<br>

twiddle.json

{
   "version": "0.4.8",
   "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "http://static.iamstef.net/ember-for-kris.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.0.0-beta.1/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.0.0/ember-template-compiler.js"
  }
}