# File lib/aws/record/validators/numericality.rb, line 106
      def message_for error_type, requirement = nil
        return options[:message] if options[:message]
        case error_type
        when :not_a_number   then 'is not a number'
        when :not_an_integer then 'must be an integer'
        when :even           then 'must be an even number'
        when :odd            then 'must be an odd number'
        when :equal_to       then "should equal #{requirement}"
        else
          "must be #{error_type.to_s.gsub(/_/, ' ')} #{requirement}"
        end
      end