authenticated_route.js

App.AuthenticatedRoute = Ember.Route.extend({
  redirectToLogin: function(transition) {
    App.Session.set('attemptedTransition', transition);
    this.transitionTo('session.new');
  },

  beforeModel: function(transition) {
    if (!App.Session.get('authToken')) {
      this.redirectToLogin(transition);
    }
  }
});