From: "David A. Black" <dblack@...>
Date: 2004-04-05T00:18:48+09:00
Subject: Re: good module use?

Hi --

On Sun, 4 Apr 2004, Lionel Thiry wrote:

> Bauduin Raphael a �crit :
> 
> > Hi,
> > 
> > I thought to create a module to add an instance variable representing 
> > the connection to a database:
> > 
> > module MyDbModule
> >       attr :conn
> >       require "postgres"
> >       pghost="localhost"
> >       pgport=nil
> >       pgoptions=nil
> >       pgtty=nil
> >       dbname="mydb"
> >       user='mylogin'
> >       password='mypassword'
> >      
> > @conn=PGconn.connect(pghost,pgport,pgoptions,pgtty,dbname,user,password)
> > 
> > end
> To use a module variable through "MyModule.my_var", just prefix the 
> variable name in the module with "self." or "@@".

Not exactly; @@var is a class variable; self.var is a method call.  If
you want an association between them, you have to write appropriate
methods:

  class X
    def self.my_var
      @@my_var
    end
    # etc.
  end


David

-- 
David A. Black
dblack@wobblini.net