Ruby Module pattern

ruby_module_pattern.rb

module NameSpace
  module MyClass
    def self.included(host_class)

      host_class.instance_eval do
        has_one :thing
        attr_accessible :something
        validate :foo

        extend ClassMethods
        include InstanceMethods
        private :something
        after_initialize do
          puts "hi"
        end
      end
    end

    module InstanceMethods

      def foo
        true
      end

    end
    module ClassMethods

    end
  end
end