From: Mike Papper <bodarotech@...>
Date: 2009-12-05T09:37:54+09:00
Subject: Re: Use of extend <module> from within a Class

Hi and thanks, please note that I am extending the module from within my
class. the problem is exactly with the call of the form self.class...

concerning what you said about self.class (inside the module):

def mb
 self.class.cee

I used this in my example because the rails module that I am extending
does this. It is included using the method named 'helper' and that must
do special things to make it work in the context of rails+controller.

What I really want to do is use url_for of the rails'
ActionController::UrlWriter. as it happens, that module does have
ClassMethods and within there a method that calls self.class (which
fails when I extend the module).

Mike
----

Jesús Gabriel y Galán wrote:
> On Sat, Dec 5, 2009 at 12:37 AM, Mike Papper <bodarotech@gmail.com> 
> wrote:
>> I would like to include a module into a 'static' class - such that all
>> the modules methods are class methods.
> 
> One basic way to do this is to have the class extend the module:
> 
> irb(main):017:0> module Z
> irb(main):018:1> def test; "testZ"; end
> irb(main):019:1> end
> => nil
> irb(main):020:0> class C
> irb(main):021:1> extend Z
> irb(main):022:1> end
> => C
> irb(main):023:0> C.test
> => "testZ"
> 
> 
>>
>> �def mb
>> � �self.class.cee
> 
> This is wrong. self.class is Class, and the Class class doesn't have a
> method "cee".
> 
>> �end
>>
>> �module ClassMethods
>> � �attr_writer :cee
>>
>> � �def cee
>> � � �puts "CCCCCCCCCCCCC"
>> � �end
>> �end
>> end
> 

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