From: James Edward Gray II <james@...>
Date: 2006-06-09T21:41:59+09:00
Subject: Re: Why the lack of mixing-in support for Class methods?

On Jun 9, 2006, at 5:58 AM, dblack@wobblini.net wrote:

> Then again, I'm not sure what's wrong with
> "extend", so I'm probably a bit out of the loop on this discussion.

Well, extend takes the instance methods of a module and makes them  
class methods on the receiver.  People are asking for a natural way  
to mix in the class methods of a module, preferably while mixing in  
the instance methods as well (as include currently does).  In short,  
they want to turn this idiom into a one liner:

module MixinForInstanceAndClassMethods
   module ClassMethods
     # ... class methods ...
   end

   extend ClassMethods

   def self.included(receiver)
     receiver.extend(ClassMethods)
   end

   # ... instance methods ...
end

class Receiver
   include MixinForInstanceAndClassMethods
end

Hope that helps.

James Edward Gray II