From: Adriano Nagel <anr@...>
Date: 2010-05-20T12:24:23+09:00
Subject: Re: define_method inside instance_eval

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
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