Retrieving model from resetController method

I am attempting to use an existing controller that I have working for viewing a user for creating a new user.

I have my newuser.js route defined as follows:

export default Ember.Route.extend({

    setupController: function(controller, model) {
        model = this.store.createRecord('user');
        this.controllerFor('settings.users.user').setProperties({isNew:true, model: model});
    },

    resetController: function(controller) {

        var user = controller.get('model');  // this always returns null
        if (user.get('isDirty')) {
            user.rollback();
        }
    },

    renderTemplate: function() {
        this.render('settings/users/user');
    }
});

Everything works as it should to display, however when resetController is called - at the point I want to remove the item from the store if it is dirty, the model is always returned as null.