From: 7stud -- <bbxx789_05ss@...>
Date: 2011-03-16T10:03:49+09:00
Subject: Re: Include module Module ActiveSupport::CoreExtensions::Array::Grouping

require "<your path to 
here->/lib/active_support/core_ext/array/grouping"

Then you will have something like this at the top of your file:

module A
  module B
    module C

      def in_group
        puts "in_group"
      end

    end
  end
end


Which means you can do this:

class MyClass
  include A::B::C
end

MyClass.new.in_group

--output:--
in_group


I think that Grouping is defined as a "mixin" module--in other words it 
is a module which contains regular def's inside it:

module ActiveSupport
  module CoreExtension
    module Array
      module Grouping

         def in_group
           ..
           ..
         end

      end
    end
  end
end


You can't create a module instance, like you can with a class.  So you 
are not able to create a Grouping instance:

obj = Grouping.new

and call the method using the instance:

obj.in_group

Rather mixin modules are created to be included by a class, and then the 
defs in the module become defs in the class.

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