Unable to use mockjax with ember data

application.controller.js

import Ember from 'ember';

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

application.route.js

import Ember from 'ember';

export default Ember.Route.extend({
  init() {
    this._super(...arguments)
    
    $.mockjax({
      url: '/parents/1',
      responseText: {
        data: {
          type: 'parent',
          id: '1',
          relationships: {
            child: {
              data: ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10'].map(child => ({ type: 'child', id: child }))
            }
          }
        }
      }
    });
    
    $.mockjax({
      url: /^\/children\/(\d+)$/i,
      urlParams: ["childId"],
      response: function(settings) {
        this.responseText = {
          data: {
            type: 'child',
            id: settings.urlParams.childId,
            attributes: {
            	parent: '1'
          	}
          }
        }
      }
    });
  },
  
  model() {
    return this.store.find('parent', '1')
  }
});

application.template.hbs

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

<p>Odd children count: {{model.oddChildren.length}}</p>

<p>Odd children ids:</p>
<ul>
	{{#each model.oddChildren key="id" as |child|}}
  <li>{{child.id}}</li>
  {{/each}}
</ul>

models.child.js

import DS from 'ember-data';

export default DS.Model.extend({
  parent: DS.belongsTo('parent', { async: true })
});

models.parent.js

import DS from 'ember-data';

export default DS.Model.extend({
  children: DS.hasMany('child', { async: true }),
  
  oddChildren: Ember.computed('children.@each.id', function() {
    return DS.PromiseArray.create({
      promise: this.get('children').then(function(children) {
        return children.filter(function(child) {
          return child.get('id') % 2 !== 0
        });
      })
    });
  })
});

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.1.0",
    "ember-data": "2.1.0",
    "ember-template-compiler": "2.1.0",
    "jquery-mockjax": "https://cdnjs.cloudflare.com/ajax/libs/jquery-mockjax/1.5.3/jquery.mockjax.js"
  }
}