function addCollaborator($user, $vars, &$errors)
{
if (!$user || $user->getId() == $this->getOwnerId()) {
return null;
}
$vars = array_merge(array('ticketId' => $this->getId(), 'userId' => $user->getId()), $vars);
if (!($c = Collaborator::add($vars, $errors))) {
return null;
}
$this->collaborators = null;
$this->recipients = null;
return $c;
}
