From: Wyatt Greene <greenewm@...>
Date: 2008-01-28T14:26:43+09:00
Subject: Re: Module Global Hash

On Jan 28, 12:17 am, Wyatt Greene <green...@yahoo.com> wrote:
> On Jan 28, 12:06 am, Ryan Lewis <c00lry...@gmail.com> wrote:
>
>
>
> > #!/usr/bin/env ruby
> > module Users
> >   class User < Struct.new(:screenname, :password, :dob, :join_date,
> > :age)
> >     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
>
> > I've also tried putting both a @ and @@ infront of user_hash but irb
> > comes up with the same error.
> > --
> > Posted viahttp://www.ruby-forum.com/.
>
> Remember that in Ruby, everything is an object and objects communicate
> by passing messages (calling methods).  So you can't get to variables
> of an object (such as user_hash).  You can only call methods that an
> object responds to.

I think what's going on here is that when the parser gets to the line
that says

user_hash = {}

it looks for a method called user_hash to execute.  It doesn't realize
that you're trying to instantiate a variable.  Maybe you should
consider turning the Users module into a class and trying @@user_hash
= {} again.