/**
* Gets a comma separated list of frontend user groups to use for the
* document ID.
*
* @return string A comma separated list of frontend user groups.
*/
protected function getDocumentIdGroups()
{
$groups = $this->pageAccessRootline->getGroups();
$groups = Rootline::cleanGroupArray($groups);
if (empty($groups)) {
$groups[] = 0;
}
$groups = implode(',', $groups);
return $groups;
}
