private function getParentArtifacts(Planning_Milestone $milestone, PFUser $user, array $backlog_item_ids)
{
$parents = $this->artifact_factory->getParents($backlog_item_ids);
$parent_tracker = $this->getParentTracker($parents);
if ($parent_tracker) {
$this->setParentItemName($milestone, $parent_tracker->getName());
if ($this->userCanReadBacklogTitleField($user, $parent_tracker)) {
$this->artifact_factory->setTitles($parents);
} else {
foreach ($parents as $artifact) {
$artifact->setTitle("");
}
}
}
return $parents;
}