valid method

@override void valid()

Implementation

@override
void valid() {
  if (required && isEmpty) {
    throw 'El dato "$label" es requerido';
  }
  var n = 1;
  for (var item in this) {
    try {
      item.valid();
    } catch (e) {
      throw '$e en elemento $n de "$label"';
    }
    n++;
  }
}