Ember simple redirect to error

error.js

App.AuthenticatedRoute = Ember.Mixin.create({
  beforeModel: function () {
    var isUserConnected = false;
    if (!isUserConnected) {
      throw new Error('Fail');
    }
  }
});

App.IndexRoute = Ember.Route.extend(App.AuthenticatedRoute, {
  beforeModel: function() {
    this._super(); // Don't forget that, or your mixins won't be called
    this.transitionTo("documents");
  }
});