Relationship errors

controllers.application.js

import Ember from 'ember';

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

models.author.js

import DS from 'ember-data';

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

models.book.js

import DS from 'ember-data';

export default DS.Model.extend({
  authors: DS.hasMany('author')
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  init() {
    this._super(...arguments);

    $.mockjax({
  		type: 'POST',
 			url: '/books',
  		status: 422,
  		dataType: 'json',
  		responseText: {
    		errors: [{
          source: {
            pointer: 'data/relationships/author/attributes/name',
          },
          title: 'Name cannot be blank'
        }]
			}
    });
  },
  model: function() {
    var author = this.store.createRecord('author');
    var book = this.store.createRecord('book', { author: author });
    
    book.save();
    return book;
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
Book errors:
<br>
{{#each model.errors as |error|}}
	{{error.attribute}}: {{error.message}}<br />
{{/each}}
<br>
<br>
Author errors:
<br />
{{#each model.author.errors as |error|}}
	{{error.attribute}}: {{error.message}}<br />
{{/each}}

twiddle.json

{
  "version": "0.7.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "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/2.4.3/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.3/ember-template-compiler.js",
        "jquery-mockjax": "https://cdnjs.cloudflare.com/ajax/libs/jquery-mockjax/1.6.2/jquery.mockjax.js"

  }
}