# File lib/active_record/validations.rb, line 309
      def validates_confirmation_of(*attr_names)
        configuration = { :message => ActiveRecord::Errors.default_error_messages[:confirmation], :on => :save }
        configuration.update(attr_names.pop) if attr_names.last.is_a?(Hash)

        attr_accessor *(attr_names.map { |n| "#{n}_confirmation" })
        
        validates_each(attr_names, configuration) do |record, attr_name, value|
          record.errors.add(attr_name, configuration[:message]) unless record.send("#{attr_name}_confirmation").nil? or value == record.send("#{attr_name}_confirmation")
        end
      end