New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  handleResponse(params) {
    this.get('model.item').then((item) => {
      item.handleResponse(params);
    });
  },
  actions: {
    foo() {
      this.handleResponse({
        bar: 'this works',
      });
    }
  }
});

models.item.js

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

export default Model.extend({
  handleResponse(params) {
    alert(params.bar);
  }
});

models.my-model.js

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

export default Model.extend({
  item: belongsTo('item'),
});

routes.application.js

import Ember from 'ember';

const {get} = Ember;

export default Ember.Route.extend({
  model() {
    const store = get(this, 'store');
    const item = store.createRecord('item');
    const model = store.createRecord('my-model', { item });
    return model;
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>
<button onclick={{action 'foo'}}>test</button>

twiddle.json

{
  "version": "0.11.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.11.0",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.11.0",
    "ember-testing": "2.11.0"
  },
  "addons": {}
}