Ember devise auth

current_user.js.coffee

# initializers/current_user.js.coffee

Ember.Application.initializer
  name: 'currentUser'

  initialize: (container) ->
    attributes = $('meta[name="current-user"]').attr('content')
    if attributes
      json = JSON.parse(attributes)

      if attributes
        user = App.User.createRecord(email: json.user.email, id: json.user.id)
        controller = container.lookup('controller:currentUser').set('content', user)
        container.typeInjection('controller', 'currentUser', 'controller:currentUser')

current_user_controller.js.coffee

# controllers/current_user_controller.js.coffee

App.CurrentUserController = Ember.ObjectController.extend
  isSignedIn: (->
    @get('content') != null
  ).property('@content')

user.js.coffee

# models/user.js.coffee

App.User = DS.Model.extend
  email: DS.attr 'string'

your_template.handlebars

<!-- templates/your_template.handlebars -->

{{#if currentUser}}
  <!-- User logged in -->
{{else}}
  <!-- User not logged in -->
{{/if}}