fix exist function for array of values and error handling delete

dbHandler.go

@@ -234,17 +234,25 @@ 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 {
-	if id[0] == 0 {
+func (dH *DBHandler) DeleteById(model any, ids ...uint) error {
+	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))
-	if err := dH.Exists(model, "id", id, false); err != nil {
-		return err
+	dH.logger.Debug("deleteById", "delete ids "+fmt.Sprint(ids))
+	err := dH.Exists(model, "id", ids, false)
+
+	// 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 dH.db.Delete(model, id).Error
+
+	return err
 }
 
 // deleteByKey
@@ -294,20 +302,43 @@ func (dH *DBHandler) DeleteByKey(model any, key string, value any, LikeSearch bo
 //
 // Returns:
 //   - error: “no record found” or DB error.
-func (dH *DBHandler) Exists(model any, key string, value any, LikeSearch bool) (err error) {
-	if LikeSearch {
-		value = strings.ReplaceAll(fmt.Sprint(value), "*", "%")
-		key = key + " LIKE ?"
-	} else {
-		key = key + " = ?"
+func (dH *DBHandler) Exists(model any, key string, value any, likeSearch bool) error {
+	var query string
+	var args any
+
+	// Detect LIKE and IN behavior
+	val := reflect.ValueOf(value)
+	isSlice := val.Kind() == reflect.Slice
+
+	switch {
+	case isSlice:
+		if val.Len() == 0 {
+			return fmt.Errorf("empty slice for %s", key)
+		}
+		query = fmt.Sprintf("%s IN ?", key)
+		args = value
+
+	case likeSearch:
+		str := strings.ReplaceAll(fmt.Sprint(value), "*", "%")
+		query = fmt.Sprintf("%s LIKE ?", key)
+		args = str
+
+	default:
+		query = fmt.Sprintf("%s = ?", key)
+		args = value
 	}
 
-	dH.logger.Debug("exists", "check if exists key "+key+" value "+fmt.Sprint(value))
-	err = dH.db.Where(key, value).First(model).Error
-	if errors.Is(err, gorm.ErrRecordNotFound) {
-		return fmt.Errorf("no record found for %s %v", key[:len(key)-1], value)
-	} else if err != nil {
-		return fmt.Errorf("query failed: %w", err)
+	dH.logger.Debug("exists", "checking existence for key "+query+" value "+fmt.Sprint(args))
+
+	var count int64
+	tx := dH.db.Model(model).Where(query, args).Count(&count)
+	if tx.Error != nil {
+		return fmt.Errorf("query failed: %w", tx.Error)
 	}
-	return
+
+	if count == 0 {
+		return fmt.Errorf("no record found for %s %v", key, value)
+	}
+
+	return nil
 }