feat: fix pay by balance

backend/app/http/posts.go

@@ -280,10 +280,6 @@ func (ctl *posts) Buy(ctx fiber.Ctx, id int64, user *model.Users) (*wechat.JSAPI
 
 	payPrice := post.Price * int64(post.Discount) / 100
 	if user.Balance >= payPrice {
-		err = models.Users.SetBalance(ctx.Context(), user.ID, user.Balance-payPrice)
-		if err != nil {
-			return nil, errors.Wrap(err, "余额支付失败")
-		}
 
 		if err := ctl.job.Add(&jobs.BalancePayNotify{OrderNo: order.OrderNo}); err != nil {
 			log.Errorf("add job error:%v", err)

backend/app/jobs/balance_pay_notify.go

@@ -56,8 +56,21 @@ func (w *BalancePayNotifyWorker) Work(ctx context.Context, job *Job[BalancePayNo
 		return JobCancel(fmt.Errorf("Order already paid, currently status: %d", order.Status))
 	}
 
+	user, err := models.Users.GetByID(context.Background(), order.UserID)
+	if err != nil {
+		log.Errorf("GetByID error:%v", err)
+		return errors.Wrap(err, "get user error")
+	}
+
+	payPrice := order.Price * int64(order.Discount) / 100
+
 	order.PaymentMethod = "balance"
 	order.Status = fields.OrderStatusCompleted
+
+	meta := order.Meta.Data
+	meta.CostBalance = payPrice
+	order.Meta = fields.ToJson(meta)
+
 	log.Infof("Updated order details: %+v", order)
 	tx, err := models.Transaction(ctx)
 	if err != nil {
@@ -65,6 +78,13 @@ func (w *BalancePayNotifyWorker) Work(ctx context.Context, job *Job[BalancePayNo
 	}
 	defer tx.Rollback()
 
+	// update user balance
+	err = models.Users.SetBalance(ctx, user.ID, user.Balance-payPrice)
+	if err != nil {
+		log.WithError(err).Error("SetBalance error")
+		return JobCancel(errors.Wrap(err, "set user balance failed"))
+	}
+
 	if err := models.Users.BuyPosts(context.Background(), order.UserID, order.PostID, order.Price); err != nil {
 		log.Errorf("BuyPosts error:%v", err)
 		return errors.Wrap(err, "BuyPosts error")

backend/database/fields/orders.go

@@ -12,4 +12,5 @@ type OrderMeta struct {
 	PayNotify    *wechat.V3DecryptPayResult    `json:"pay_notify"`
 	RefundResp   *wechat.RefundOrderResponse   `json:"refund_resp"`
 	RefundNotify *wechat.V3DecryptRefundResult `json:"refund_notify"`
+	CostBalance  int64                         `json:"cost_balance"` // 余额支付的金额
 }