From: Robert Klemme <shortcutter@...>
Date: 2008-01-28T19:18:27+09:00
Subject: Re: Module Global Hash

2008/1/28, Gary Wright <gwtmp01@mac.com>:
>
> On Jan 28, 2008, at 12:06 AM, Ryan Lewis wrote:
>
> > #!/usr/bin/env ruby
> > module Users
> >   class User < Struct.new(:screenname, :password, :dob, :join_date,
> > :age)

You do not need to inherit from the new struct class, instead you can do

User = Struct.new(:screenname, :password, :dob, :join_date, :age)
class User
 ...
end

> >     def initialize(sn, pw, dob)
> >       self.screenname = sn
> >       self.password   = pw
> >       self.dob        = Time.parse(dob)
> >       self.join_date  = Time.now
> >       self.age        = Time.now.year - Time.parse(dob).year
> >     end
> >   end
> >   #########################################
> >   user_hash = {}
> >
> >   def new(sn, pw, dob)
> >     Users::user_hash[sn] = User.new(sn, pw, dob)
> >   end
> >   #########################################
> >   module_function :new
> > end
> >
> > I'm trying to make it so when I call:
> >    Users::new("screenname", "pass", "1/15/91")
> >
> > it adds a new instance of the User class into user_hash, but when I
> > execute the above code in IRB I get a NoMethodError for user_hash for
> > the Users:module

Note though that this approach will prevent any User instance from
being garbage collected.  This might or might not be what you want.  I
do not know the use case but there is another option: you can traverse
all User instances via ObjectSpace.

Ah, and another remark: the implementations show so far will also
allow to create two users with the same name but only one of them will
be accessible via the Hash.

Kind regards

robert

-- 
use.inject do |as, often| as.you_can - without end