From: Brian Candler <b.candler@...>
Date: 2008-10-12T00:28:01+09:00
Subject: Re: Help me to better understand modules

Zouplaz wrote:
> I've noticed that, with the self. version I need to prefix them
> with the module's name, so having namespacing which tends to make the
> code more readable.

That's right - you are explicitly calling a method which belongs to the 
module itself, not to any object which mixes in the module.

> module Payment
>    def self.method_payment
>    end
> end
> 
> class AClass
>    include Payment
> 
>    def go
>      Payment.method_payment()
>    end
> end

You do not need "include Payment" in class AClass. You can call 
Payment.method_payment from anywhere. The module "Payment" itself is the 
receiver of the method.

You only need "include Payment" if you want to mix in *instance methods* 
(those which are defined in the module without "self") - they then 
become instance methods of class AClass.

Regards,

Brian.
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