/**
* Makes sure the node to delete is not used as a native target by other nodes.
*
* @throws Exception if the node to delete is the native target of another node.
*/
public function delete($key)
{
$native_refs = $this->select('nid')->filter_by_nativeid($key)->all(\PDO::FETCH_COLUMN);
if ($native_refs) {
throw new Exception('Node record cannot be deleted because it is used as native source by the following records: \\1', array(implode(', ', $native_refs)));
}
return parent::delete($key);
}
