New Twiddle

adapters.application.js

import DS from 'ember-data';

export default DS.RESTAdapter.extend({
  findAll() {
    return {
      data: [{
        id: 'foo1',
        type: 'foo'
      }],
      included: [{
        id: 'foo1',
        type: 'foo',
        attributes: { name: 'name-foo1' },
        relationships: [{
          bars: [{
            data: {
              id: 'bar1',
              type: 'bar'
            }
          }]
        }]
      }, {
        id: 'bar1',
        type: 'bar',
        attributes: {
          name: 'name-bar-1'
        },
        relationships: {
          foo: {
            links: {
              related: '/bla'
            }
          }
        }
      }]
    };
  }
});

controllers.application.js

import Ember from 'ember';

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

models.bar.js

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

export default Model.extend({
  foo: belongsTo('foo'),
  name: attr(),
});

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({
  bars: hasMany('bar'),
  name: attr(),
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return this.store.findAll('foo');
  }
});

serializers.application.js

export default DS.JSONAPISerializer.extend({
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#each model as |m|}}
	<div>{{m.name}} - {{m.bars}}:{{m.bars.length}}</div>
  <ul>
  	{{#each m.bars as |b|}}
    	<li>{{b.name}}</li>
    {{/each}}
  </ul>
{{/each}}
<br>
<br>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}