title: Easy way to initialize new ember-data model from json data?
body: <p>I wan't to get initial data for a new model from server, eg. from url /users/new.json which responds:</p>
  
  <pre><code>{"user":
    {
      "default_value1": "foo", 
      "default_value2": "bar",
      "embedded_foo": [{"default_value3": "baz"}]
    }
  }
  </code></pre>
  
  <p>User model:</p>
  
  <pre><code>App.User = DS.Model.extend({
    embeddedFoo: DS.hasMany('App.EmbeddedFoo'),
    defaultValue1: DS.attr('string'),
    defaultValue2: DS.attr('string')
  })
  </code></pre>
  
  <p>There is a lot more values, so is there some way to initialize a new record using existing ember-data mappings?</p>