validateValue method

  1. @override
String? validateValue(
  1. String fieldName,
  2. dynamic value
)
override

Implementation

@override
String? validateValue(String fieldName, value) {
  if (value == null) return null;
  if (value is! int) return '[$fieldName] must be an integer value';
  if (value <= 0) return '[$fieldName] must be a positive integer';
  return null;
}