From: Brian Buckley <briankbuckley@...>
Date: 2007-02-20T10:59:51+09:00
Subject: Re: include Module in another Module

Thanks, Pit.

Rounding this out, I notice now that classes that "include Enumerable"
after Enumerable is enhanced by "include Foo" have the extra method,
but classes that "include Enumerable" before Enumerable is enhanced
don't (core class Array is in this category).

Interesting to learn this behavior is considered a bug, and may one
day be fixed.

Interestingly, re-including Enumerable to Array, i.e., the line

class Array; include Enumerable end

corrects the bug for Array --- this is not necessarily a useful thing
to know since as you suggest putting code directly into Enumerable
rather than by using an include appears to be the way to go here.

--Brian


On 2/19/07, Pit Capitain <pit@capitain.de> wrote:
> Brian Buckley schrieb:
> > What is the proper syntax/code to include a Module into another
> > Module?  My attempt below is not working.
> >
> > module Foo
> >  def xxx; "this is xxx" end
> > end
> >
> > module Enumerable
> >  include Foo
> > end
> >
> > puts [].xxx  #does not  work, xxx not defined for Array.  Array
> > includes Enumerable, right?
>
> Brian, this isn't a problem of your syntax/code, but a (well known)
> problem of the Ruby interpreter. There's no known solution yet. You have
> to change the Enumerable module directly.
>
> Regards,
> Pit
>
>