From: "David A. Black" <dblack@...>
Date: 2008-05-06T00:36:24+09:00
Subject: Re: attr_accessor for class variable?

Hi --

On Tue, 6 May 2008, sayoyo Sayoyo wrote:

> Hi,
>
> Is there an equivalent for attr_acessor for the class varialbles? or I
> have to write a function each time I wish to exppse the class varaible
> to other clasess?

In Rails there's a "cattr_*" set of methods that wrap class variables.
"cattr" is, in my opinion, a bad choice of name, since it implies that
it's representing an "attribute" of an object, whereas class variables
are visible to many objects and therefore not suitable for
representing attributes.

One thing you might consider is creating regular accessor methods for
the class object, which will use instance variables belonging to the
class:

   class C
     class << self
       attr_accessor :x
     end
   end

   C.x = 1

etc. Unless there's some reason you specifically need class variables,
that's a cleaner and more accurate way for a class object to maintain
and expose state.


David

-- 
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