/**
  * Delete this object
  * 
  * If $drop_subitems is TRUE subitems will be delete from the database. If it 
  * is false relation will be nullified
  *
  * @param boolean $drop_subitems
  * @return boolean
  * @throws DBQueryError
  */
 function delete($drop_subitems = true)
 {
     db_begin_work();
     $delete = parent::delete();
     if (is_error($delete) || !$delete) {
         db_rollback();
         return $delete;
     }
     // if
     $subitems = $this->getSubitems();
     if (is_foreachable($subitems)) {
         foreach ($subitems as $subitem) {
             if ($drop_subitems) {
                 $delete = $subitem->delete();
                 if (is_error($delete)) {
                     db_rollback();
                     return $delete;
                 }
                 // if
             } else {
                 $subitem->setParent(null, false);
                 $save = $subitem->save();
                 if (is_error($save)) {
                     db_rollback();
                     return $save;
                 }
                 // if
             }
             // if
         }
         // foreach
     }
     // if
     StarredObjects::deleteByObject($this);
     // Attachments
     if ($this->can_have_attachments) {
         Attachments::deleteByObject($this);
     }
     // if
     // Subscriptions
     if ($this->can_have_subscribers) {
         Subscriptions::deleteByParent($this);
     }
     // if
     // Asignments
     if ($this->can_have_assignees) {
         Assignments::deleteByObject($this);
     }
     // if
     // Activity log
     if ($this->log_activities) {
         ActivityLogs::deleteByObject($this);
     }
     // if
     // Reminders
     if ($this->can_send_reminders) {
         Reminders::deleteByObject($this);
     }
     // if
     search_index_remove($this->getId(), 'ProjectObject');
     db_commit();
     return true;
 }