protected function autoSaveExpandableFieldsSave($iId, array $aExpandableFields)
    {
        foreach ($aExpandableFields as $oField) {
            $aData = array_filter((array) $oField->data);
            $this->saveAssociatedItems(
                $iId,
                $aData,
                $oField->id_column,
                $oField->model,
                $oField->provider
            );
        }
    }