title: Ember.js array as model's property
body: <p>Cheers!
  I have some model, and one attribute of it is an array, but for some reasons (I use mongoDB on the server and it's problem with embedded models and ember-data) I can't do somthing like this:</p>
  
  <pre><code>App.Foo = DS.Model.extend({
    ...
    numbers: DS.hasMany('App.Bar')
  )};
  
  App.Bar = DS.Model.extend({
    ...
    number: DS.attr('number')
  });
  </code></pre>
  
  <p>I need something like this:</p>
  
  <pre><code>App.Bar = DS.Model.extend({
    numbers: DS.attr('array')
  });
  </code></pre>
  
  <p>But there is no array type of attributes in ember-data, how to be?</p>