gistfile1.rb

class Signup::CustomersController < ApplicationController
  inherit_resources
  defaults :resource_class => User, :collection_name => 'users', :instance_name => 'user'
  actions :new, :create

  def create
    create! do |success, failure|
      success.html do
        resource.roles |= [Role.find_by_name('customer')]
        flash[:notice] = "Customer #{resource.name} successfuly registered"
        sign_in(resource)
        redirect_to root_path
      end
    end
  end
end