Using Ember initializers and injections to setup the `currentUser` within your app.

account_routes.js

App.AccountEditRoute = Ember.Route.extend({
  setupController: function(controller) {
    controller.set('content', this.get('currentUser'));
  }
});

index.html.haml

%noscript
  .container
    .alert
      %strong
        Javascript is disabled!
      The AppName UI is built entirely in Javascript, as such you need to enable
      Javascript in your browser to continue.

:javascript
  var currentUser = jQuery.parseJSON('#{current_user_json}');

injections.js

Ember.Application.initializer({
  name: "currentUser",

  initialize: function(container, application) {
    var store = container.lookup('store:main');
    var obj = store.load(CrashLog.User, currentUser);

    container.optionsForType('user', { instantiate: false, singleton: true });
    container.register('user', 'current', CrashLog.User.find(obj.id));
  }
});

Ember.Application.initializer({
  name: "injectCurrentUser",
  after: 'currentUser',

  initialize: function(container) {
    container.injection('controller:application', 'currentUser', 'user:current');
    container.typeInjection('route', 'currentUser', 'user:current');
  }
});

I couldn't get it to work, I kept returning Guest in my template view.

http://stackoverflow.com/q/16548010/1515899

@amaanr @AlexanderZaytsev Perhaps hooking into the deferReadiness and advanceReadiness methods is necessary?

Ember.Application.initializer

  name: 'currentUser'

  initialize: (container) ->
    App.deferReadiness()
    $ ->
      store = container.lookup('store:main')
      attributes = $('meta[name="current-user"]').attr('content')
      console.log attributes
      if attributes
        object = store.load(App.User, JSON.parse(attributes))
        user = App.User.find(object.id)

        controller = container.lookup('controller:currentUser').set('content', user)

        container.typeInjection('controller', 'currentUser', 'controller:currentUser')
      App.advanceReadiness();

This might not work at all... I just learned about the Readiness methods a few minutes ago. :P

@AlexanderZaytsev Thanks for that article, it helped a ton

Is there a non-private alternative to typeInjection?

@amaanr @AlexanderZaytsev I use the readiness calls that @listrophy suggests.

Remember to tell currentUser Initializer to fire up after loading store, otherwise store will be undefined

Ember.Application.initializer({
  name: 'currentUser',
  after: 'store',