implement clean deletion of Seminaries

questtypes/dragndrop/DragndropQuesttypeModel.inc

@@ -127,6 +127,16 @@
         }
 
 
+        /**
+         * Delete a Quest.
+         * 
+         * @param   int $questId    ID of Quest to delete
+         */
+        public function deleteQuest($questId)
+        {
+            $this->db->query('DELETE FROM questtypes_dragndrop WHERE quest_id = ?', 'i', $questId);
+        }
+
 
         /**
          * Create a new Drag&Drop field for a Quest.