/**
  * @return int[]
  */
 public function getKanbanTrackerIds($project_id)
 {
     $rows = $this->dao->getKanbansForProject($project_id);
     $kanban_tracker_ids = array();
     foreach ($rows as $kanban_data) {
         $kanban_tracker_ids[] = $kanban_data['tracker_id'];
     }
     return $kanban_tracker_ids;
 }
 /**
  * @return Tracker[]
  */
 public function getTrackersUsedAsKanban(Project $project)
 {
     $trackers = array();
     foreach ($this->dao->getKanbansForProject($project->getId()) as $row) {
         $tracker = $this->tracker_factory->getTrackerById($row['tracker_id']);
         if ($tracker) {
             $trackers[] = $tracker;
         }
     }
     return $trackers;
 }