validateWithParent method
override
Implementation
@override
FutureOr<Result> validateWithParent(
dynamic value,
Map<String, dynamic> map, {
bool exists = true,
}) {
final cond = condition.validator(map);
if (cond is Future<Result>) return cond.then((cr) => _evalBranch(cr, value));
return _evalBranch(cond, value);
}