Best Way to Include and Extend a Module Method

include_extend.rb

module Swingable
    def self.included(base)
        base.extend(Swingable)
    end

    def swing
        puts 'Did a swing!'
    end
end

class User
  include Swingable
end

User.swing # => 'Did a swing!'
User.new.swing # => 'Did a swing!'