增加文档

backend/internal/modules/paymentconfig/mutation.go

@@ -295,17 +295,17 @@ func (r *Repository) Delete(ctx context.Context, id uint64, actorID uint64, meta
 			return err
 		}
 
-		var usedCount int64
 		usedDB := tx.Model(&model.PaymentOrder{}).
 			Where("payment_config_id = ?", item.ID).
 			Or("(payment_config_id = ? OR payment_config_id IS NULL) AND provider = ? AND merchant_id = ? AND pay_way = ?", 0, item.Provider, item.MerchantID, item.PayWay)
-		if err := usedDB.
-			Count(&usedCount).Error; err != nil {
-			return err
-		}
-		if usedCount > 0 {
+		var usedPayment model.PaymentOrder
+		err := usedDB.Select("id").Limit(1).Take(&usedPayment).Error
+		if err == nil {
 			return ErrCannotDeleteInUse
 		}
+		if !errors.Is(err, gorm.ErrRecordNotFound) {
+			return err
+		}
 
 		if err := tx.Delete(&item).Error; err != nil {
 			return err