# File lib/active_record/validations.rb, line 399
      def validates_length_of(*attrs)
        # Merge given options with defaults.
        options = {:too_long     => ActiveRecord::Errors.default_error_messages[:too_long],
                   :too_short    => ActiveRecord::Errors.default_error_messages[:too_short],
                   :wrong_length => ActiveRecord::Errors.default_error_messages[:wrong_length]}.merge(DEFAULT_VALIDATION_OPTIONS)
        options.update(attrs.pop.symbolize_keys) if attrs.last.is_a?(Hash)

        # Ensure that one and only one range option is specified.
        range_options = ALL_RANGE_OPTIONS & options.keys
        case range_options.size
          when 0
            raise ArgumentError, 'Range unspecified.  Specify the :within, :maximum, :minimum, or :is option.'
          when 1
            # Valid number of options; do nothing.
          else
            raise ArgumentError, 'Too many range options specified.  Choose only one.'
        end

        # Get range option and value.
        option = range_options.first
        option_value = options[range_options.first]

        # Declare different validations per option.
        validity_checks = { :is => "==", :minimum => ">=", :maximum => "<=" }
        message_options = { :is => :wrong_length, :minimum => :too_short, :maximum => :too_long }

        case option
        when :within, :in
          raise ArgumentError, ':within must be a Range' unless option_value.is_a?(Range) # '
          (options_without_range = options.dup).delete(option)
          (options_with_minimum = options_without_range.dup).store(:minimum, option_value.begin)
          validates_length_of attrs, options_with_minimum
          (options_with_maximum = options_without_range.dup).store(:maximum, option_value.end)
          validates_length_of attrs, options_with_maximum
        when :is, :minimum, :maximum
          raise ArgumentError, ":#{option} must be a nonnegative Integer" unless option_value.is_a?(Integer) and option_value >= 0 # '
          message = options[:message] || options[message_options[option]]
          message = (message % option_value) rescue message
          validates_each(attrs, options) do |record, attr, value|
            record.errors.add(attr, message) if value.nil? or !value.size.method(validity_checks[option])[option_value]
          end
        end
      end