finish: gorm序列化

utils/basic/basic.go

@@ -13,7 +13,8 @@ var (
 	CodeServiceErr = &StatusResponse{510, "server logic error"} // server logic 错误
 	CodeUnAuth     = &StatusResponse{401, "unauthorized"}       // 未授权
 
-	CodeUpdateErr = &StatusResponse{5000, "update database error"} // update database logic 错误
+	CodeUpdateErr   = &StatusResponse{5000, "update database error"}                                             // update database logic 错误
+	CodeDupGuestErr = &StatusResponse{5001, "the user is already a guest user and does not need to apply again"} // 用户已经是guest用户不需要重复申请 错误
 )
 
 type Response struct {