public function getResourceVersion($con = null) { if ($this->aResourceVersion === null && $this->resource_version_id !== null) { include_once 'plugins/sfPropelVersionableBehaviorPlugin/lib/model/om/BaseResourceVersionPeer.php'; $this->aResourceVersion = ResourceVersionPeer::retrieveByPK($this->resource_version_id, $con); } return $this->aResourceVersion; }