Ember-Sortable re-order items

controllers.application.js

import Ember from 'ember';

const {computed} = Ember;

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  sortdef: ['id'],
  
  sortedModel: computed.sort('model', 'sortdef'),
  
  actions: {
    reset() {
    	this.set('sortdef', ['id']);
    },
    sortByIdDesc() {
    	this.set('sortdef', ['id:desc']);
    },
    sortByOrder() {
    	this.set('sortdef', ['order']);
    },
    reorderItems(items) {
    	items.forEach((item, index) => {
      	Ember.set(item, 'order', index);
      });
    }
  }
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
  	return [
      {id: 1, name: "A", order: 5},
      {id: 2, name: "B", order: 2},
      {id: 3, name: "C", order: 4},
      {id: 4, name: "D", order: 3},
      {id: 5, name: "E", order: 1}
     ];
  }
});

templates.application.hbs

<h1>Ember Sortable sort test</h1>
<br>
<br>
{{#sortable-group tagName="ul" onChange=(action "reorderItems") as |group|}}
  {{#each sortedModel as |item|}}
    {{#sortable-item tagName="li" model=item group=group handle=".handle"}}
      {{item.name}}
      <span class="handle">&varr;</span>
    {{/sortable-item}}
  {{/each}}
{{/sortable-group}}
<br><br>
<button {{action "reset"}}>
	Sort by id
</button>
<button {{action "sortByIdDesc"}}>
	Sort by id desc
</button>
<button {{action "sortByOrder"}}>
	Sort by order
</button>

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {
  	"ember-sortable": "1.9.0"
  }
}