From: Robert Dober <robert.dober@...>
Date: 2007-07-24T17:02:31+09:00
Subject: Re: Inherited & load

On 7/24/07, F. Senault <fred@lacave.net> wrote:
> Hello.
>
> I've written a mechanism to dynamically load plugins inheriting from a
> base class, using the self.inherited method.
>
> Now, in an irb session, I noticed that, even if I (re)load the classes,
> the self.inherited is only triggered once.  Short example :
>
> > ruby -v
> ruby 1.8.6 (2007-03-13 patchlevel 0) [i386-freebsd6]
>
> > cat first.rb
> #! /usr/local/bin/ruby
> load "test.rb"
> load "test.rb"
>
> > cat test.rb
> #! /usr/local/bin/ruby
> class Test
>   def self.inherited(c)
>     puts "#{c} inherited Test !"
>   end
> end
> load "test2.rb"
>
> > cat test2.rb
> #! /usr/local/bin/ruby
> puts "In #{__FILE__}."
> class Test2 < Test ; end
>
> > ruby first.rb
> In ./test2.rb.
> Test2 inherited Test !
> In ./test2.rb.
>
> Is there a trick somewhere that would allow me to trigger the inherited
> method at each time the file containing the "sub-class" (e.g. Test2) is
> loaded ?
As Todd pointed out already, "inheritance" will happen only once,
might it be that you have  chosen a suboptimal mechanism ;) for what
you want to achieve?
Maybe you could tell us a little bit more about that?

Cheers
Robert


-- 
I always knew that one day Smalltalk would replace Java.
I just didn't know it would be called Ruby
-- Kent Beck