From: Sean O'Halpin <sean.ohalpin@...>
Date: 2005-10-24T20:48:47+09:00
Subject: Re: How to find all the subclasses of a class?

Incorporating Robert's suggestions, this is a bit better:

class Module
  def subclasses
    classes = []
    ObjectSpace.each_object(Module) do |m|
      classes << m if m.ancestors.include? self
    end
    classes
  end
end

Regards,

Sean