From: Steve Midgley <public@...>
Date: 2007-02-19T14:33:48+09:00
Subject: Answer: Module that includes both class and instance methods?

Hello,

After an hour of farting around trying to figure this out, of course I 
do figure it out 20 seconds after writing to the list. Well, here's one 
solution to my issue - I'd still love to see a one-line solution if 
anyone can come up with one (but it's not necessary for me at all, just 
curiosity and desire to learn cool Rubyisms):

[code starts]

module Models
   module Ver
     def is_versioned
       include Models::VersionsTables::InstanceMethods
       self.extend Models::VersionsTables::ClassMethods
     end
   end
   module VersionsTables
     module InstanceMethods
       def instance_test
         "instance test"
       end
     end
     module ClassMethods
       def class_test
         "class_test"
       end
     end
   end
end


class Live
   extend Models::Ver

   is_versioned
end

puts "::"+Live.class_test
live = Live.new
puts live.instance_test

[code ends]

So it uses two lines of code, but I can live with that because only the 
second line of code actually causes the class AND instance methods to 
be included - so they're all or nothing - you either get class and 
instance or nothing (the reason I care is that some monkey-see, 
monkey-do coder down the road could pull something into their class out 
of context and I want these functions to either work or fail, not yield 
partial and erroneous capability).

Sorry for being the noise in your signal,

Steve
-
The law is an envious monster.
   - Rex Stout