From: Venkat Bagam <bagam_venkat@...>
Date: 2007-11-03T19:09:58+09:00
Subject: Re: defining methods dynamically

Drew Olson wrote:
> Venkat Bagam wrote:
>> Hi Folks,
>> 
>> I have an array has_roles = %w[admin employee ...] which is a subset of
>>  application_roles = ["admin", "employee", "manager"...]
> 
> I personally like this approach. It's all a matter of taste:
> 
> class Application
>   @@possible_roles = [:admin, :employee, :manager]
> 
>   def self.roles *args
>     args.each do |role|
>       class_eval do
>         define_method(role) do
>           true
>         end
>       end
>     end
> 
>     (@@possible_roles - args).each do |non_role|
>       class_eval do
>         define_method(non_role) do
>           false
>         end
>       end
>     end
>   end
> end
> 
> class MyApplication < Application
>   roles :admin, :employee
> end
> 
> my_app = MyApplication.new
> puts my_app.admin        # => true
> puts my_app.manager    # => false


Hi thanks for the reply... Its working well but I just need some 
illustration.

1. whats happening when the my_app object is created.?
2. whats happening here def self.roles *args
    I mean, how come *args take :admin, :employee into it?

thanks and regards
Venkat
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