public function trackObjectIDs()
 {
     $types = project_project_node_types();
     $nids = array();
     $projects = db_query('SELECT nid FROM {node} WHERE type IN (:types)', array(':types' => $types));
     foreach ($projects as $project) {
         $nids[] = $project->nid;
     }
     return $nids;
 }
 /**
  * Get project node IDs.
  */
 public function trackObjectIDs()
 {
     return db_query('SELECT nid FROM node WHERE status = 1 AND type IN (:types)', array(':types' => project_project_node_types()))->fetchCol();
 }