From: zig <ziggurism@...>
Date: 2007-03-25T10:40:10+09:00
Subject: Re: class methods and instance variables in ActiveRecord::Base

On Mar 24, 3:56 pm, "Giles Bowkett" <gil...@gmail.com> wrote:

> The answer to your question is that the class which inherits is opened
> up, and this method is defined within it. Not the instances -- the
> instances are untouched. This opens up the Class object itself. Then,
> obviously, it sets an instance variable. At that point, what it's
> doing is setting an instance variable of the Class object.
>

OK, I think I'm getting there.

Is an instance variable of the class object the same thing as a class
variable?

For example, consider

class A
 @@var1
end

and

class A
 class << self
  attr_reader :var1
  attr_writer :var1
 end
end

In both cases I call that variable with A.var1.  Are they the same?