Updating the emberJS view after an ajax request

So I am trying to send a custom action to my server with ajax and update the emberJS model in the callback. My controller code looks like this:

PlatformUI.CampaignItemController = Ember.ObjectController.extend({
  actions: {
    deleteCampaign: function(){
      var campaign = this.get('model');
      campaign.deleteRecord();
      campaign.save();
    },
    startCampaign: function(){
      var campaign = this.get('model');
      $.ajax({
        url: '/campaigns/' + campaign.get('id') + '/campaign_start.json',
        type: 'GET',
        success: function(data, textStatus, xhr) {
          campaign.set('status', data.started);
          //campaign.save();
        },
        error: function(xhr, textStatus, errorThrown) {
          console.log(xhr);
          alert('start campaign failed');
        }
      });
    }
  }
});

My model looks like this:

PlatformUI.Campaign = DS.Model.extend({

  name: DS.attr('string'),
  status: DS.attr('string'),
  updated_at: DS.attr('date'),
  user_id: DS.attr('number'),
  created_at: DS.attr('date')

});

The problem is that it is not refreshing the view when I perform that action. I am new to emberJS so I don't really know if the model was really updated either.