gistfile1.js

App.SignupRoute = Ember.Route.extend({
  model: function() {
    return this.store.createRecord("user");
  }
});

App.SignupController = Ember.ObjectController.extend({
  actions: {
    signup: function() {
      var self = this;
      var model = this.get("model");

      model.save().then(function() {
        self.transitionToRoute("signin");
      }, function() {
        // failure ...
      });
    }
  } 
});