From: "Wayne E. Seguin" <wayneeseguin@...>
Date: 2007-08-01T05:44:19+09:00
Subject: Re: Help:  Get list of modules which are included in the class

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Chirag,

This is how I handle it in my applications:

# lib/ruby_extensions.rb
=======================================
class Module
   def included_modules
     ( ancestors - [ Kernel ] ).select { | x | x.class == Module &&  
x != Kernel }
   end

   def directly_included_modules
     ancestors - superclass.ancestors - [self]
   end

   def inherited_modules
     superclass.included_modules - self.directly_included_modules
   end
end

=======================================
irb:
=======================================
 >> module Module1; end
   =>nil

 >> class Class1; include Module1 end
   =>Class1

 >> module Module2; end
   =>nil

 >> class Class2 < Class1; include Module2 end
   =>Class2

 >> Class1.included_modules
   =>[Module1]

 >> Class2.included_modules
   =>[Module2, Module1]

 >> Class1.directly_included_modules
   =>[Module1]

 >> Class2.directly_included_modules
   =>[Module2]

 >> Class1.inherited_modules
   =>[]

 >> Class2.inherited_modules
   =>[Module1]

Actually, I also allow for filtering out of other modules than Kernel  
but that's not relevant here.

I sincerely hope this helps.

=======================================
(easy irb example paste:)
=======================================
module Module1; end
class Class1; include Module1 end
module Module2; end
class Class2 < Class1; include Module2 end

Class1.included_modules
Class2.included_modules

Class1.directly_included_modules
Class2.directly_included_modules

Class1.inherited_modules
Class2.inherited_modules


--
Wayne E. Seguin
Sr. Systems Architect & Systems Admin
wayneseguin@gmail.com




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