Call a class method in an after_save
===

That is may be a stupid point, but I don't find the solution.

I have a simple model with a class method `update_menu` and I want that it is called after each save of instance.

    Class Category
      attr_accessible :name, :content
      

      def self.menu
         @@menu ||= update_menu
      end

      def self.update_menu
         @@menu = Category.all
      end
    end

So what is the correct syntax to get the `after_filter` call `update_menu`?

I tried:
   
    after_save :update_menu

But it looks for the method on the instance (which does not exist) and not on the class.

Thanks for your answers.
