role.rb

  #Role.rb
  ...
  def authorizable_class
    return nil if authorizable_type.nil?
    klass = begin
      authorizable_type.split("::").inject(Object){|x, y| x.const_get(y)}
    rescue NameError => e
      msg = "Class not found: `#{authorizable_type}'"
      Merb.logger.warn!(msg)
      nil
    end
  end

  def callable_actions
    klass = authorizable_class
    return [] if klass.nil? || !klass.respond_to?(:callable_actions)# make sure is a controller
    actions = klass.callable_actions.keys - klass.superclass.callable_actions.keys
    actions.sort
  end