限制只能发布1条公告

app/controller/Notice.php

@@ -68,6 +68,9 @@ class Notice extends BaseController
             } else {
                 validate(NoticeValidate::class)->scene('add')->check($param);
 
+                $queryRes = NoticeModel::where('id','>=',1)->find();
+                if ($queryRes) throw new ValidateException('限制只能发布1条公告');
+
                 $CustomerService = new NoticeModel();
                 $CustomerService->save([
                     'title'         => $param['title'],