gistfile1.rb

require 'active_support/concern'
require 'active_support/core_ext/object/acts_like'

module InfiniteComparable
  extend ActiveSupport::Concern

  included do
    class_exec do
      alias_method_chain :<=>, :other

    end
  end

  define_method :'<=>_with_other' do |other|
    return self.send(:'<=>_without_other', other) if other.class == self.class

    conversion = :"to_#{self.class.name.downcase}"
    if other.respond_to?(:infinite?) && other.infinite?
      -other.infinite?
    elsif other.respond_to?(conversion)
      self.send(:'<=>_without_other', other.send(conversion))
    else
      self.send(:'<=>_without_other', other)
    end
  end

end