SomeForm

SomeForm.dart

class SomeForm extends FormData<SomeObj> {
  FormField<Duration> field1;
  FormField<int> field2;
  * * *
  DocketForm({@required SomeObj obj}) : super(data: obj) {
    contact = add(
      data.field1,
      onSaved: (v) => data.copyWith(field1: v),
      validator: (v) => v.isNullOrSpace ? 'Invalid field1 value' : null,
    );
  * * *    
}