From: Calamitas <calamitates@...>
Date: 2009-03-18T09:08:32+09:00
Subject: Re: Dynamically extending modules once they have been included

On Tue, Mar 17, 2009 at 1:12 AM,  <pete@p373.net> wrote:
> The only alternative I've find is to loop through the ObjectSpace
> (filtering on classes) and find out which class's ancestors include
> the module I want to extend and then include my extension module
> straight into the class.

Below is code taken from my FOSDEM presentation. It tries to tackle
the problem you are describing. It is not well-tested or anything, but
it did pass the examples I used in the presentation. Just execute this
code before any of your module definitions and see if it helps.

Peter


class Module

  def included_in
    @included_in ||= {}
  end

  def included(m)
    unless included_in[m]
      included_in[m] = true
      m.update_inclusions
    end
  end

  def extended(m)
    included(class << m ; self ; end)
  end

  def update_inclusions
    included_in.each do |m, _|
      m.send(:include, self)
      m.update_inclusions
    end
  end

end