/**
* @param string $action Permissions action to require to return revision
* @return AbstractRevision|null
* @throws InvalidDataException
*/
public function loadTopicTitle($action = 'view')
{
if ($this->workflow->isNew()) {
throw new InvalidDataException('New workflows do not have any related content', 'missing-topic-title');
}
if ($this->topicTitle === null) {
$found = $this->storage->find('PostRevision', array('rev_type_id' => $this->workflow->getId()), array('sort' => 'rev_id', 'order' => 'DESC', 'limit' => 1));
if (!$found) {
throw new InvalidDataException('Every workflow must have an associated topic title', 'missing-topic-title');
}
$this->topicTitle = reset($found);
// this method loads only title, nothing else; otherwise, you're
// looking for loadRootPost
$this->topicTitle->setChildren(array());
$this->topicTitle->setDepth(0);
$this->topicTitle->setRootPost($this->topicTitle);
}
if (!$this->permissions->isAllowed($this->topicTitle, $action)) {
$this->addError('permissions', $this->getDisallowedErrorMessage($this->topicTitle));
return null;
}
return $this->topicTitle;
}
