title: How to find model with Ember Data?
body: <p>What's the equivalent of</p>
  
  <pre><code>App.Person.find({age: 30})
  </code></pre>
  
  <p>in the <a href="https://github.com/emberjs/data/blob/master/TRANSITION.md" rel="nofollow">new Ember Data</a>?</p>
  
  <p>I.e. how do I get an record array based on an attribute?</p>