# Sobreescribe el metodo event de acts_as_state_machine para poder agregarle funcionalidad de logger.
module ValidationWatcher
  def self.included(receiver)
    receiver.extend ClassMethods
    receiver.class_eval do
      class << self
        alias_method_chain :validates_uniqueness_of, :watcher
      end
      write_inheritable_attribute :unique_fields, []
      class_inheritable_reader    :unique_fields
    end
  end
  module ClassMethods
    def validates_uniqueness_of_with_watcher(*args)
      read_inheritable_attribute(:unique_fields) << args[0]
      validates_uniqueness_of_without_watcher(args)
    end
  end
end

class ActiveRecord::Base
  include ValidationWatcher
end