New Twiddle

controllers.application.js

import Ember from 'ember';
//import User from 'demo-app/models/user'
//import UserProfile from 'demo-app/models/user-profile'

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  init() {
  	let user = this.store.createRecord('user')
  	let userProfile = this.store.createRecord('user-profile')
  
  	user.set('details', userProfile)
  
		user.eachRelationship((name, descriptor) => {
        Ember.Logger.warn(name, descriptor)
    })
  }
});

models.user-profile.js

import DS from 'ember-data';

export default DS.Model.extend({
    "firstName": DS.attr('string'),
    "lastName": DS.attr('string'),
    "dob": DS.attr('date'),
    "phone": DS.attr('string'),
    "url": DS.attr('string')
});

models.user.js

import DS from 'ember-data';

export default DS.Model.extend({
    'username': DS.attr('string'),
    'password': DS.attr('string'),
    'email': DS.attr('string'),
    'details': DS.belongsTo('user-profile')
});

templates.application.hbs

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

twiddle.json

{
  "version": "0.7.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.4.3",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "2.4.3"
  }
}