gistfile1.js

EmberTodo.ItemController = Ember.ObjectController.extend({
  completed: function(key, value) {
    if (arguments.length > 1){
      var item = this.get("content");
      console.log("initial value");
      console.log(item.get("completed"));
      item.set("completed", value);
      console.log("after value");
      console.log(item.get("completed"));
      console.log("is dirty?");
      console.log(item.get("isDirty"));
      item.transaction.commit();
    }
    return this.get('content').get('completed');
  }.property('content.completed')
});