From: Trans <transfire@...>
Date: 2005-08-02T07:11:03+09:00
Subject: Re: module / inheritance question


Joe Van Dyk wrote:
> class Parent
    extend self
>   def foo
>     puts "Parent::foo called"
>   end
> end
>
> module TheModule
>   def boo
>     Parent.foo
>   end
> end
>
> class Child < Parent
>   include TheModule
> end
>
> Child.new.boo
>
> # Two questions:
> # 1)  Why do I need Child.boo?  Shouldn't function TheModule.boo be mixed in
> #     to Child?

Include brings in the instance-level methods not the module-level
methods.

> # 2)  Any way I can get TheModule.boo to call Parent.foo?

'extend self' can be used to put instance-level methods on the
module-level too.

HTH,
T.