From: Sandro Paganotti <sandro.paganotti@...>
Date: 2008-04-29T21:25:25+09:00
Subject: Re: Mixins

Well, maybe you can try this way...

module Mod

 def Mod.included(mod)
 mod.class_eval <<-EOS
    alias_method :old_initialize, :initialize
    def initialize
      @anyvar = 10
      old_initialize
    end
 EOS
 end

 def func
 puts @anyvar
 end
end

class MyClass

  def initialize
  #read configuration
  puts @anyvar
  @anyvar = 2
  func()
  end


 include Mod
end

MyClass.new
# => 10
# => 2


On Tue, Apr 29, 2008 at 11:03 AM, David A. Black <dblack@rubypal.com> wrote:
> Hi --
>
>
>  On Tue, 29 Apr 2008, Sandro Paganotti wrote:
>
>
> > I don't know if I get the point but this seems work:
> >
> > module Mod
> > @anyvar = 10
> >
> > def func
> >  puts @anyvar
> > end
> > end
> >
>
>  You've got two variables called @anyvar in that code, and they have no
>  relation to each other.
>
>  The first one is an instance variable belonging to the module Mod
>  (that is, the actual object Mod). The second one represents an
>  instance variable that will belong to each object that executes the
>  func method.
>
>  So the @anyvar = 10 line is serving no purpose.
>
>
>  David
>
>  --
>  Rails training from David A. Black and Ruby Power and Light:
>   INTRO TO RAILS         June 9-12            Berlin
>   ADVANCING WITH RAILS   June 16-19           Berlin
>   INTRO TO RAILS         June 24-27           London (Skills Matter)
>  See http://www.rubypal.com for details and updates!
>
>



-- 
Go outside! The graphics are amazing!