fix existing function add reflect, slow but safe

dbHandler.go

@@ -234,17 +234,27 @@ func (dH *DBHandler) UpdateValuesByKey(model any, key string, value any) error {
 //
 // Returns:
 //   - error: Any deletion error.
-func (dH *DBHandler) DeleteById(model any, id ...uint) error {
+func (dH *DBHandler) DeleteById(model any, ids ...uint) error {
-	if id[0] == 0 {
+	if len(ids) == 0 {
+		return fmt.Errorf("no IDs provided")
+	}
+
+	if ids[0] == 0 {
 		dH.logger.Debug("deleteById", "delete all")
 		return dH.db.Where("1 = 1").Delete(model).Error
 	}
 
-	dH.logger.Debug("deleteById", "delete ids"+fmt.Sprint(id))
+	dH.logger.Debug("deleteById", "delete ids "+fmt.Sprint(ids))
-	if err := dH.Exists(model, "id", id, false); err != nil {
+	if !dH.Exists(model, "id", ids, false) {
-		return err
+		return errors.New("no matching id(s) found")
 	}
-	return dH.db.Delete(model, id).Error
+
+	// Always use Model() to avoid GORM’s “limit 1” safeguard
+	if err := dH.db.Model(model).Where("id IN ?", ids).Delete(nil).Error; err != nil {
+		return fmt.Errorf("delete failed: %w", err)
+	}
+
+	return err
 }
 
 // deleteByKey
@@ -275,39 +285,45 @@ func (dH *DBHandler) DeleteByKey(model any, key string, value any, LikeSearch bo
 	return dH.db.Where(key+" = ?", value).Delete(model).Error
 }
 
-// exists
+func (dH *DBHandler) Exists(model any, key string, value any, likeSearch bool) (found bool) {
-//
+	var query string
-// Description:
+	var args any
-//
+
-//	Checks whether a record exists matching the specified key/value filter.
+	// Detect LIKE and IN behavior
-//
+	val := reflect.ValueOf(value)
-// Behavior:
+	isSlice := val.Kind() == reflect.Slice
-//   - Performs a `First` query on the database.
+
-//   - If `LikeSearch` is true, performs a LIKE query.
+	switch {
-//   - Returns an error if the record does not exist or query fails.
+	case isSlice:
-//
+		if val.Len() == 0 {
-// Parameters:
+			dH.logger.Error("Exists", fmt.Sprintf("empty slice for %s", key))
-//   - model:      Model struct type to search.
+			return false
-//   - key:        Column name to filter by.
+		}
-//   - value:      Value to match.
+		query = fmt.Sprintf("%s IN ?", key)
-//   - LikeSearch: Whether to use wildcard search.
+		args = value
-//
+
-// Returns:
+	case likeSearch:
-//   - error: “no record found” or DB error.
+		str := strings.ReplaceAll(fmt.Sprint(value), "*", "%")
-func (dH *DBHandler) Exists(model any, key string, value any, LikeSearch bool) (err error) {
+		query = fmt.Sprintf("%s LIKE ?", key)
-	if LikeSearch {
+		args = str
-		value = strings.ReplaceAll(fmt.Sprint(value), "*", "%")
+
-		key = key + " LIKE ?"
+	default:
-	} else {
+		query = fmt.Sprintf("%s = ?", key)
-		key = key + " = ?"
+		args = value
 	}
 
-	dH.logger.Debug("exists", "check if exists key "+key+" value "+fmt.Sprint(value))
+	dH.logger.Debug("exists", "checking existence for key "+query+" value "+fmt.Sprint(args))
-	err = dH.db.Where(key, value).First(model).Error
+
-	if errors.Is(err, gorm.ErrRecordNotFound) {
+	t := reflect.TypeOf(model)
-		return fmt.Errorf("no record found for %s %v", key[:len(key)-1], value)
+	if t.Kind() == reflect.Ptr {
-	} else if err != nil {
+		t = t.Elem()
-		return fmt.Errorf("query failed: %w", err)
 	}
-	return
+
+	tx := dH.db.Where(query, args).Find(model)
+
+	if tx.Error != nil {
+		dH.logger.Error("Exists", fmt.Sprintf("query failed: %w", tx.Error))
+		return false
+	}
+	return tx.RowsAffected > 0
 }