Rollback Changeset hasMany

controllers.application.js

import Ember from 'ember';
import Changeset from 'ember-changeset';

export default Ember.Controller.extend({
  init() {
  	this._super(...arguments);
    
    this.get('store').createRecord('foo', {
      users: [
        this.get('store').createRecord('user', {name: 'bob'}),
        this.get('store').createRecord('user', {name: 'bill'})
      ]
    });
    const foo = this.get('store').peekAll('foo').get('firstObject');
    const changeset = new Changeset(foo);
    this.set('foo', changeset);
  },
  
  appName: 'Ember Twiddle',
  
  fooChanges: Ember.computed('foo.changes', function() {
  	return JSON.stringify(this.get('foo.changes'),null,2);
  }),
  
  actions: {
    titleChanged(event) {
      if (event.code === 'Enter') {
        this.set('foo.title', event.target.value);
        event.target.value = '';
      }
    },
    changeUsers() {
      this.get('foo.users').setObjects([
        this.get('store').createRecord('user', {name: 'janet'}),
        this.get('store').createRecord('user', {name: 'rhonda'})
      ]);
    },
    rollbackUsers() {
      console.log(this.get('foo.changes'));
      this.get('foo').rollback();
    }
  }
});

models.foo.js

import Model from "ember-data/model";
import attr from "ember-data/attr";
import { belongsTo, hasMany } from "ember-data/relationships";

export default Model.extend({
  title: attr('string'),
  users: DS.hasMany('user', { async: true })
});

models.user.js

import Model from "ember-data/model";
import attr from "ember-data/attr";
import { belongsTo, hasMany } from "ember-data/relationships";

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

templates.application.hbs

<h2>Users association:</h2>

<ul>
	{{#each foo.users as |user|}}
		<li>{{user.name}}</li>
  {{/each}}
</ul>

<h2>Foo Title (enter to submit):</h2>

<label>Change:
<input onkeyup={{action 'titleChanged'}}/>
</label>

<br>
<br>
<div>
	<button onclick={{action 'changeUsers'}}>Change Users</button>
	<button onclick={{action 'rollbackUsers'}}>Rollback</button>
</div>
<br>
<hr>

<h3>Changeset changes:</h3>
<pre>{{fooChanges}}</pre>


{{outlet}}

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-changeset": "1.2.0" 
	}
}