数据模型使用指针类型字段以避免空值自动更新的问题

web/services/transaction.go

@@ -56,7 +56,7 @@ func (s *transactionService) PrepareTransaction(q *q.Query, uid int32, now time.
 			return nil, err
 		}
 
-		var expireAt = time.Time(coupon.ExpireAt)
+		var expireAt = time.Time(u.Z(coupon.ExpireAt))
 		if !expireAt.IsZero() && expireAt.Before(now) {
 			_, err = q.Coupon.
 				Where(q.Coupon.ID.Eq(coupon.ID)).
@@ -71,26 +71,26 @@ func (s *transactionService) PrepareTransaction(q *q.Query, uid int32, now time.
 			return nil, errors.New("订单金额未达到使用优惠券的条件")
 		}
 
-		switch {
-		// 该优惠券不属于当前用户
-		default:
-			return nil, errors.New("优惠券不属于当前用户")
-
-		// 公开优惠券
-		case coupon.UserID == 0:
-			amount = amount.Sub(coupon.Amount)
-
-		// 指定用户的优惠券
-		case coupon.UserID == uid:
-			amount = amount.Sub(coupon.Amount)
-			if time.Time(coupon.ExpireAt).IsZero() {
-				_, err = q.Coupon.
-					Where(q.Coupon.ID.Eq(coupon.ID)).
-					Update(q.Coupon.Status, int32(coupon2.StatusUsed))
-				if err != nil {
-					return nil, err
+		if coupon.UserID != nil {
+			switch *coupon.UserID {
+			// 指定用户的优惠券
+			case uid:
+				amount = amount.Sub(coupon.Amount)
+				if expireAt.IsZero() {
+					_, err = q.Coupon.
+						Where(q.Coupon.ID.Eq(coupon.ID)).
+						Update(q.Coupon.Status, int32(coupon2.StatusUsed))
+					if err != nil {
+						return nil, err
+					}
 				}
+			// 该优惠券不属于当前用户
+			default:
+				return nil, errors.New("优惠券不属于当前用户")
 			}
+		} else {
+			// 公开优惠券
+			amount = amount.Sub(coupon.Amount)
 		}
 	}
 
@@ -161,7 +161,7 @@ func (s *transactionService) PrepareTransaction(q *q.Query, uid int32, now time.
 		Method:  int32(method),
 		Type:    int32(tType),
 		Amount:  amount,
-		PayURL:  payUrl,
+		PayURL:  &payUrl,
 	}
 	err = q.Trade.Create(&trade)
 	if err != nil {
@@ -172,8 +172,8 @@ func (s *transactionService) PrepareTransaction(q *q.Query, uid int32, now time.
 	var bill = m.Bill{
 		BillNo:  ID.GenReadable("bil"),
 		UserID:  uid,
-		TradeID: trade.ID,
-		Info:    subject,
+		TradeID: &trade.ID,
+		Info:    &subject,
 		Type:    int32(billType),
 		Amount:  amount,
 	}
@@ -284,10 +284,10 @@ func (s *transactionService) CompleteTransaction(q *q.Query, data *TransactionCo
 	// 如果是未支付，则更新支付状态
 	case trade2.StatusPending:
 		trade.Status = int32(trade2.StatusSuccess)
-		trade.OuterNo = transId
+		trade.OuterNo = &transId
 		trade.Payment = payment
-		trade.PaidAt = orm.LocalDateTime(paidAt)
-		trade.PayURL = ""
+		trade.PaidAt = u.P(orm.LocalDateTime(paidAt))
+		trade.PayURL = u.P("")
 		_, err = q.Trade.Updates(trade)
 		if err != nil {
 			return nil, err
@@ -340,8 +340,8 @@ func (s *transactionService) FinishTransaction(q *q.Query, tradeNo string, now t
 		Select(q.Trade.Status, q.Trade.CancelAt, q.Trade.PayURL).
 		Updates(m.Trade{
 			Status:   int32(trade2.StatusCanceled),
-			CancelAt: orm.LocalDateTime(now),
-			PayURL:   "",
+			CancelAt: u.P(orm.LocalDateTime(now)),
+			PayURL:   u.P(""),
 		})
 	if err != nil {
 		return err