From: Phrogz <phrogz@...>
Date: 2007-12-14T09:49:59+09:00
Subject: Re: Enforce implementation of Module method

On Dec 13, 3:38 pm, Paul <pdavi...@gmail.com> wrote:
> Let's say I have the following module:
>
> ------------------------
> module Parenting
>
>   def add_child(a_child)
>     self.children.push(a_child)
>   end
>
>   def delete_child(a_child)
>     self.children.delete(a_child)
>   end
>
>   def children
>     # need to implement
>   end
>
> end
> ------------------------
>
> Is there a way to enforce that the 'children' method is implemented in
> any class which includes this module?  Or do I simply rely on a
> commenting convention, as above?

module Parenting
  def children
    raise "OOPS!" #Better error message here
  end
end

If a class defines that method, it will shadow the module method. As
long as the class method doesn't try to call super, you should be good
to go.