sinple emluate scoped module by refinements

ar.rb

#!/usr/bin/env ruby

class ActiveRecord
  def save
    puts 'ActiveRecord'
  end
end

hoge.rb

#!/usr/bin/env ruby

module Hoge
  refine ActiveRecord do
    def nya
      save
      puts 'nya'
    end

    def save
      puts 'hoge save'
    end
  end
end

model.rb

#!/usr/bin/env ruby

require './ar'
require './hoge'

class A < ActiveRecord
end

non_refine.rb

#!/usr/bin/env ruby

require './model'

A.new.save # => ActiveRecord
A.new.nya  # nya is undefined

refine.rb

#!/usr/bin/env ruby

require './model'
using Hoge

A.new.save # hoge
A.new.nya # hoge, nya