Can an Ember Controller bind to changed events for it's own properties?

Question

Given a controller like:

App.SignInController = Ember.Controller.extend
  authenticated: false
  authenticatedDidChange: (() =>
    console.log @get('authenticated')
  ).observes('controller.authenticated')

This doesn't seem to work so I must not understand how observers works. I think it is supposed to created an observer on controller.authenticated. However when I call @set("authenticated", true) nothing is logged.

Updated: I did try replacing controller.authenticated with App.signInController.authenticated to no avail.

What am I missing?

Answer 1

Eventually I stumbled upon an answer this Yehuda Katz on Quora.

App.friendsController = Ember.ArrayProxy.extend({
  contentDidChange: function() {
    // stuff here
  }.observes('content')
});

After reviewing this answer I noticed that the observes call only specifies the name of the property with no controller or App.signInController prefix. Changing my solution above to just observes('authenticated') works.

App.SignInController = Ember.Controller.extend
  authenticated: false
  authenticatedDidChange: (() ->
    console.log @get('authenticated')
  ).observes('authenticated')