title: Get the first record of model in emberjs
body: <p>I need a way to get first record of specific model .at this time im using a way like this :</p>
  
  <pre><code>this.store.findAll('configModel').then(function(items) {
   items.get('content')[0].set('isEnableShowUniqueName', true);
   items.get('content')[0].set('isSavedToServer', false);
   items.get('content')[0].save();
  });
  </code></pre>
  
  <p>but I think there is a better and ember way out there? is this way true? do you know any better way? but know this I haven't id of record I need the only first record of the model.</p>