From: Phillip Gawlowski <cmdjackryan@...>
Date: 2011-05-08T19:40:00+09:00
Subject: Re: Question regarding interaction between modules and classes

On Sun, May 8, 2011 at 11:03 AM, uwe@kubosch.no <uwe@kubosch.no> wrote:
> Get uting @@foo instead of @foo

Better: Don't use class variables. If there's a @@foo somewhere in the
ancestry tree of a module or class, this one will be used, instead of
what you set @@foo to in your own class.

A class method works much better:

class Klass
  @foo = "foo"
  def self.foo # note the self receiver. Very important!
    @foo
  end
end

Klass.foo
=> "foo"

To get @foo from another class:

class KlassTwo
  @foo = Klass.foo # Klass has to be defined before KlassTwo, obviously.
  def self.foo
    @foo
  end
end

-- 
Phillip Gawlowski

Though the folk I have met,
(Ah, how soon!) they forget
When I've moved on to some other place,
There may be one or two,
When I've played and passed through,
Who'll remember my song or my face.