validate method

  1. @override
String? validate(
  1. F form,
  2. E key,
  3. DateTime value
)
override

Implementation

@override
String? validate(F form, E key, DateTime value) {
  final otherValue = form.getValueByKey(otherKey);

  if (otherValue is! DateTime) return null;

  if (!value.isAfter(otherValue)) {
    return loc.mustBeAfterDateField(otherFieldName);
  }

  return null;
}