From: Nit Khair <sentinel.2001@...>
Date: 2008-10-03T00:45:01+09:00
Subject: Problem extending (adding methods) to class

I am trying to extend a class developed by someone else (its from the
ncurses-ruby lib). I need to add some fields and methods to it.

1. I tried directly extending it the usual way.
    class MyForm < FORM

  However, all attempts to access my methods would give a NoMethodError
on the base class Ncurses::FORM.

2. I then looked up the source and copied the following *on top* of my
class MyForm.

  module Form
    class FORM
      attr_reader :user_object

      def user_object=(obj)
        @user_object = obj
      end
    end
 end

I changed user_object to "my_fields". This approach works, but means i
cannot actually extend the class. I need a heirarchy below this each
adding its methods and data.


Now I am wondering whether my approach is wrong. Is the class
locked/final in some way?

I am aware of an alternative appoach: create an instance of FORM in a
class (no more inheritance). Use method_missing to call methods of
original class. However, before i make changes, would like to understand
if I am doing something wrong here.

Thanks.
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