private function getFieldValue(?PageModel $page): string
    {
        if (null === $page) {
            return '';
        }

        return (string) $page->{$this->field};
    }
private function getFieldValue(?PageModel $page): string
    {
        if (null === $page) {
            return '';
        }

        return (string) $page->{$this->field};
    }
Returns a field value from the page model.