From: Joel VanderWerf <vjoel@...>
Date: 2008-10-19T03:52:00+09:00
Subject: Re: define_method inside a module

MR Damien wrote:
> hi,
> 
> I am trying to use some dynamic features of ruby.
> 
> Inside my module, I try to add some method dynamicaly but I get an error
> when I am trying to.
> 
> 
> 
> module Rubyhaviour
>   def add(object)
>     name = "@" + object.class.downcase
> 
>     if self.instance_variable_get(name)
>       self.instance_variable_get(name) << object
>     else
>       self.instance_variable_set(name, Array.new)
>       self.instance_variable_get(name) << object
> 
>       define_method(name) do
>         instance_variable_get("@#{name}")
>       end
>     end
>   end
> end
> undefined method `define_method' for #<Test:0x2ce631c> (NoMethodError)

Try working in the singleton class:

class C
   def foo
     class << self
       define_method :bar do puts "BAR"; end
     end
   end
end

c = C.new
c.foo
c.bar

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407