fix: 修复扭蛋道具扣除逻辑

modules/player/service/item.go

@@ -10,6 +10,7 @@ import (
 	dictservice "blazing/modules/dict/service"
 
 	"github.com/gogf/gf/v2/database/gdb"
+	"github.com/gogf/gf/v2/errors/gerror"
 	"github.com/gogf/gf/v2/frame/g"
 )
 
@@ -58,12 +59,28 @@ func (s *ItemService) UPDATE(id uint32, count int) error {
 		return err
 	}
 	if ok {
-		_, err := s.dbm(s.Model).Where("item_id", id).Increment("item_cnt", count)
+		updateModel := s.dbm(s.Model).Where("item_id", id)
+		if count < 0 {
+			updateModel = updateModel.Where("item_cnt + ? > 0", count)
+		}
+
+		result, err := updateModel.Increment("item_cnt", count)
 		if err != nil {
 			return err
 		}
 
+		affected, err := result.RowsAffected()
+		if err != nil {
+			return err
+		}
+		if affected == 0 {
+			return gerror.New("item update failed: no rows affected")
+		}
+
 	} else {
+		if count <= 0 {
+			return gerror.New("item update failed: cannot insert non-positive item count")
+		}
 		m := s.dbm(s.Model)
 		data := g.Map{
 			"player_id": s.userid,