From: Jan Svitok <jan.svitok@...>
Date: 2006-10-18T22:19:28+09:00
Subject: Re: Mixin a module method as a class method

On 10/18/06, Farrel Lifson <farrel.lifson@gmail.com> wrote:
> Is it possible to mix in a module method to become a class method? I'd
> like to define the method_added method in a module and then mix it
> into a class like so
>  module Foo
>    def self.method_added(method)
>      puts "Added #{method}"
>    end
>  end
>
>  class Bar
>   include Foo
>   def bar
>   end
>   def baz
>   end
>  end
> So that I get
>  Added bar
>  Added baz
> printed out. Is there any way to do this besides making Foo a class
> and subclassing Foo from it?
>
> Farrel

See previous thread: 'Ruby for Rails p.462-464 - why include vs.
extend?' or api.rubyon rails and there *::*::ClassMethods

basicly something like this:

module A
 module M
  module ClassMethods
    def some_method
      #...
    end

  def included(c)
    c.extend(ClassMethods)
  end
 end
end

and then a class later that does this:

class B
 include A::M
end