    # File lib/active_record/validations.rb, line 330
          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