Cream Guest user

The Guest user and current_user is currently set up like this:

module Cream
  module UserControl
    def current_user   
      if !session[:user_id]
        @guest ||= Guest.create(guest_options) 
        return @guest
      end
      if session[:user_id]  
        begin
          clazz = session[:user_class_name].constantize
          @current_user ||= clazz.find session[:user_id] 
          return @current_user
        rescue Exception => e
          puts "Error with current_user: user_class_name = '#{session[:user_class_name]}' error: #{e}"
        end
      end
    end

    def set_language language_code
     current_user.language_code = language_code if current_user # for non-guest user
     guest_options[:language_code] = language_code # for guest user
    end    

    def guest_options
     session[:guest_options] ||= {}
    end
  end
end

The UserControl module is then included into the ApplicationController like this:

ApplicationController.send :include, Cream::UserControl

The idea is to create a new simple Guest user if session[:user_id] is nil. The Guest user is then populated with whatever you put in the session[:guest_options]. This can be used to set locale, language, country etc.
If there is a session[:user_id], it will be used to retrieve the user of the given type from the database, using the session[:user_class_name] (now set on sign_in)

def sign_in(resource_or_scope, *args)
  ...
  # set user id
  session[:user_id] = resource.id
  session[:user_class_name] = resource.class.name
end

Please provide suggestions or patches to improve this logic. Thanks!