From: Travis Whitton <whitton@...>
Date: 2003-09-16T01:27:31+09:00
Subject: Problem Dynamically Loading a Module

Hi all,
I'm having some trouble with trying to dynamically load a module at runtime.
The following example demonstrates the problem I'm encountering.

dyninclude.rb
--------------------
class DynamicInclude
  def initialize(dynmod)
    DynamicInclude.load_module(dynmod)
  end

  def DynamicInclude.load_module(modname)
    load "#{modname}.rb"
    include Object.const_get(modname.to_s)
  end
end

Hello.rb
--------------------
module Hello
  def greeting
    puts "Hello"
  end
end

Goodbye.rb
--------------------
module Goodbye
  def greeting
    puts "Goodbye"
  end
end

Example
--------------------
d = DynamicInclude.new("Hello")
d.greeting() # prints Hello
e = DynamicInclude.new("Goodbye")
e.greeting() # prints Goodbye
d.greeting() # prints Goodbye

So, how can I dynamically include multiple module without the negative side
effect of previous class instances inheriting the new methods? I'm suspecting
that the fact that load_module is a class method is playing a role here, but
I can't make it work without making load_module a class method. Any help would
be appreciated.

Sincerely,
Travis Whitton <whitton@atlantic.net>