From: Dhruva Sagar <dhruva.sagar@...>
Date: 2010-05-20T12:44:37+09:00
Subject: Re: define_method inside instance_eval

--0016367d6deca4e2650486fe6461
Content-Type: text/plain; charset=UTF-8

To define class methods from a class method :

def status_field(*args)
 self.metaclass.send(:define_method, :status_all) { args  }
end

OR

def status_field(*args)
 (class << self; self; end).instance_eval { define_method(:status_all) {
args } }
end

On Thu, May 20, 2010 at 08:54, Adriano Nagel <anr@safira.com> wrote:

> Dhruva Sagar wrote:
> > Ok I reread your problem.
> >
> > In your status_all method you can simply return a *args.to_a*. That
> > should
> > be the simplest approach.
> >
> > def status_field(*args)
> >  instance_eval { define_method(:status_all) {|*args| args.to_a } }
> > end
>
> Actually, args already is an array and you don't need it as an argument
> for status_all (it was passed to status_field).
>
> But the problem here is that this will produce an instance method, not a
> class method.
>
> > But I am not sure exactly why your taking this approach or what your
> > intentions are. What should be the behavior on subsequent calls to
> > status_field ?
>
> I'm extending ActiveRecord, and status_field does more than just define
> status_all. For example:
>
> class User < ActiveRecord::Base
>  status_field :inactive, :active, :suspended
> end
>
> will create scopes, instance methods like status_inactive,
> status_inactive?, etc.
>
> User.status_all should return all the possible user status. I have it
> working, but I would like to learn a better way to do it.
>
> Thanks,
>
> --
> Adriano
> --
> Posted via http://www.ruby-forum.com/.
>
>


-- 

Thanks & Regards,
Dhruva Sagar.

--0016367d6deca4e2650486fe6461--