gistfile1.rb

# 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')