gistfile1.txt

public function getAsset()
{
  return $this->getDataProperty('Asset', 1, 'file');
}

######### In una parent

public function getDataproperty($model, $id, $property)
{
  $object = Doctrine::getTable($model)->find($id);

  if ($object)
  {
    return $object->getValue($property);
  }

  return false;
}