From: "Vinícius Baggio Fuentes" <vinibaggio@...>
Date: 2010-05-06T22:06:03+09:00
Subject: Class variable "scope"

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Hi all,

I've been writing a library for me to play with metaprogramming as an
exercise, but then I got stuck
on a non-metaprogramming issue:

## a.rb
class A
  def self.add_something(*sth)
    @@my_things ||= []
    @@my_things << sth
  end

  def self.my_things
    @@my_things
  end
end

## b.rb
require 'a'

class B < A
  add_something :bag, :boots
end
require 'a'

## c.rb
class C < A
  add_something :sword, :shield
end

The result, when requiring both c and b into an irb shell is, as expected:

ruby-1.8.7-p249 > C.my_things
 => [[:bag, :boots], [:sword, :shield]]
ruby-1.8.7-p249 > B.my_things
 => [[:bag, :boots], [:sword, :shield]]

I did achieve the following:

C.my_things
[[:sword, :shield]]
B.my_things
[[:bag, :boots]]

by moving my_things method into each child class and using the method on the
add_something method, but there must be a better way. How one could improve
this?

Thanks in advance!

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