From: Joel VanderWerf <vjoel@...>
Date: 2003-01-22T03:52:44+09:00
Subject: Re: Mixins

Gennady wrote:
> I am completely lost -- it looks like it is not possible to redefine a 
> method at all with a mixin:
>  
> class Test
>   def foo
>      puts "Test#foo"
>   end
> end
>  
> module Mixin
>   def foo
>     puts "Mixin#foo"
>   end
>   def bar
>     puts "Mixin#bar"
>   end
> end
>  
> class Test
>   include Mixin
> end
>  
> Test.new.foo  #==> Test#foo
> Test.new.bar  #==> Mixin#bar
>  
> So new method are added just fine, however a method I would like to 
> redefine stays the same. Is it how it was supposed to work? And how to 
> actually do redefine a method? Should there be any tricks involved, like 
> aliasing?

Test.ancestors #==> [Test, Mixin, Object, Kernel]

So actually, your Test#foo is replacing Mixin#foo, because Test occurs 
before Mixin on the method search path.

class Test
   def foo
     super
   end
end

Test.new.foo  #==> Mixin#foo