默认学生

@@ -329,6 +329,9 @@ class User extends Api
         $user = new \app\admin\model\User;
         $user->save(['is_default'=>true],['id'=>$new_id]);
 
+        $user = new \app\admin\model\User;
+        $user->save(['is_default'=>false],['id'=>$old_id]);
+
         if (!$ret) {
             $this->error($this->auth->getError());
         }