Ruby include & extend

gistfile1.rb

# Version 1
# Some basic include & extend approach
module AnyModule
  def an_instance_method
  end
  
  module ClassMethods
    def a_class_method
    end
  end
end

class AnyClass
  include AnyModule
  extend AnyModule::ClassMethods
end

# Version 2
# Use method hook self.included
module AnyModule
  def self.included(base)
    base.extend(ClassMethods)
  end

  def an_instance_method
  end
  
  module ClassMethods
    def a_class_method
    end
  end
end

class AnyClass
  include AnyModule
end