title: Ember data not getting relationships
body: <p>I'm  using Ember 1.13.3 and ember-data 1.13.5.</p>
  
  <p>I have 2 models with a relationship:</p>
  
  <p>spot:</p>
  
  <pre><code>import DS from 'ember-data';
  
  export default DS.Model.extend({
    user: DS.belongsTo('user'),
    description: DS.attr('string'),
    created_at: DS.attr('date'),
    image_src: DS.attr('string')
  });
  </code></pre>
  
  <p>user:</p>
  
  <pre><code>import DS from 'ember-data';
  
  export default DS.Model.extend({
    username: DS.attr('string'),
    email: DS.attr('string'),
    avatar: DS.attr('string'),
    spots: DS.hasMany('spot')
  });
  </code></pre>
  
  <p>now I call in all the spots and loop over them. Everything display fine of the spot model; however, when I try to retrieve the user's username <code>spot.user.username</code> it doesn't work. I checked the network and not even a request is being sent out to <code>users/:user_id</code>. </p>
  
  <p>I also tried adding <code>asyn: true</code>:</p>
  
  <pre><code>DS.belongsTo('user', {async: true})
  </code></pre>
  
  <p>but this also did not work. Is there a new way to do relationships in ember 1.13? I know that the belongsTo call is being reach because it appears as a deprecation in the ember console:</p>
  
  <pre><code>In Ember Data 2.0, relationships will be asynchronous by default. You must set `user: DS.belongsTo('user', { async: false })` if you wish for a relationship remain synchronous.
  </code></pre>