From: Stefano Crocco <stefano.crocco@...>
Date: 2008-07-22T21:10:02+09:00
Subject: Re: define_method with dynamic method name

On Tuesday 22 July 2008, Marcin Balinski wrote:
> Hi
> I want to define new method with dynamic name eg:
>
> def method_name
>   "abrakadabra"
> end
>
> define_method(method_name.to_sym){puts "done."}
>
> I cant do it this way, it causes: undefined local variable or method
> `method_name'
> Is there any other way to achieve this?

Are you using define method directly in the class body or from within an 
instance method? In the first case (and also if you're using it from a class 
method), then you need to define method_name as a class method, not as an 
instance method:

class C

  def self.method_name
    "abrakadabra"
  end

  define_method(method_name){puts "done."}

end

C.new.abrakadabra

By the way, you don't need to call to_sym, since define_method also accepts a 
string as argument.

I hope this helps

Stefano