Robert Dober schrieb:
>> I'm most curious about "self.included". I checked out the docs on 
>> 'included'
>> (http://www.ruby-doc.org/core/classes/Module.html#M001661).
> This is the doc about #include not #included!!

You are looking for the wrong Method - see documentation about "Object#extend". 
The usages are visible in the example:

module ClassMethods
   def method_one
     puts "in method_one"
   end

   def method_two
     puts "in method_two"
   end
end

def incl1(x)
   x.extend(ClassMethods)
end

module Mymod
   def self.incl2(x)
     x.extend(ClassMethods)
   end
end

incl1(String)
Mymod.incl2(Array)


String.method_one # => in method_one
String.method_two # => in method_two

Array.method_one # => in method_one
Array.method_one # => in method_one

Wolfgang NáÅasi-Donner