加分报错

@@ -31,10 +31,10 @@ class StudyScoreLog extends Model
         $teams = new Team();        //战队表
         $item = new Item();         //项目表
         $ronda = new Ronda();       //场次表
-        $stu = $study->where('unique', $unique)->find()->toArray();             //学生信息
-        $xm = $item->where('id', $id)->find()->toArray();                       //项目信息
-        $team = $teams->where('title', $stu['team'])->find()->toArray();        //战队信息
-        $ronda = $ronda->where('title',$stu['ronda'])->find()->toArray();       //场次信息
+        $stu = \db('study')->where('unique', $unique)->find();             //学生信息
+        $xm = \db('item')->where('id', $id)->find();                       //项目信息
+        $team = \db('team')->where('title', $stu['team'])->find();        //战队信息
+        $ronda = \db('ronda')->where('title',$stu['ronda'])->find();       //场次信息
         $radar = explode(',', $xm['radar_ids']);
         $score = explode(',', $xm['score']);
         $sum_score = 0;