# Common pattern for including instance and class level modules
module SomeModule
  def self.included(my_class)
    my_class.extend ClassMethods
  end
 
  module ClassMethods
    def some_class_method(*args)
      # do something at class level
      puts args.inspect
    end
  end
 
  # these are instance methods
  #
  def some_instance_method(*args)
    # do something at instance level
    puts args.inspect
  end
end
 
class MyGreatClass
  include SomeModule
  
  # Now I can use the included class methods
  
  some_class_method 'Hello!'
 
end
 
# And instances methods
 
MyGreatClass.new.some_instance_method('Blah')