Access model in controller-action?

I'm editing an object with a form and want to save the changed object from within the controller-action which is bound to the submit-button. I don't want to bind the values directly to the template.

Here's the admin/edit.hbs

<form>
    <label>Title
      <input name="title" type="text" {{ bind-attr value=title }} />
    </label>
    <label>Permalink
      <input name="permalink" type="text" {{ bind-attr value=permalink }} />
    </label>
    <label>Post
      {{textarea value=body cols="80" rows="12"}}
    </label>
  <button {{ action 'submitAction' }}>Submit</button>
</form>

This is the controller admin/edit.hbs import Ember from 'ember';

export default Ember.ObjectController.extend({    
  actions: {
      submitAction: function() {
        var newTitle = this.get('title');
        // how to access the model here?
      }
    }
});