From: Stefano Crocco <stefano.crocco@...>
Date: 2007-12-13T21:03:14+09:00
Subject: Re: method accesible only from another class

Alle giovedì 13 dicembre 2007, Mario Ruiz ha scritto:
> I need that a method can be accesible only from other class but only
> this method:
>
> class Nueva
>   def metodo
>     puts 'metodo'
>   end
>   def metodo3
>     puts 'metodo3'
>   end
> private
>   def metodo2
>       puts 'metodo2'
>     end
>   end
>
> class Nueva2
>   def metodo
>     puts 'Nueva2metodo'
>     Nueva.new.metodo2()
>   end
>   def metodo2
>     puts 'Nueva2metodo2'
>   end
> end
>
> I need to call the Nueva.metodo2 from Nueva2.metodo and I want this
> method can be accesible only from Nueva2 class. Also I don't want the
> other methods from Nueva Class.
>
> How can I do it???
>
> Thank you in advance.

I don't think you can do exactly that. A method can only be public (everyone 
can call it), protected (it can be called only from instances of the same 
class) or private (can only be called by the implicit receiver, self). What 
you can do is use send, which allows to call every kind of method. In your 
case:


class Nueva2
  def metodo
    puts 'Nueva2metodo'
    Nueva.new.send(:metodo2)
  end
  def metodo2
    puts 'Nueva2metodo2'
  end
end

Note that also other classes can access the Nueva#metodo2 method using send, 
and there's nothing you can do about it (well, you could override Nueva#send 
and Nueva#__send__, if you really need to be sure other classes can't do 
that, but I don't think it's truly necessary).

I hope this helps

Stefano