module snippet supporting "serialization"

to_file.rb

#!/usr/bin/ruby

module ToFile
  def filename
    "object_#{self.object_id}.txt"
  end

  def to_f
    File.open(filename, 'w') {|f| f.write(to_s)}
  end
end #module


class Person
  include ToFile
  attr_accessor :name

  def initialize name
    @name = name
  end

  def to_s
    name
  end
end

Person.new('nazgob').to_f