public function getMinArticleOrder($publication = null, $issue = null, $section = null)
{
$qb = $this->getEntityManager()->createQueryBuilder();
$qb->select('MIN(a.articleOrder)')->from('Newscoop\\Entity\\Article', 'a');
if ($publication) {
$qb->andWhere('a.publication = :publication')->setParameter('publication', $publication);
}
if ($issue) {
$qb->andWhere('a.issueId = :issue')->setParameter('issue', $issue->getId());
}
if ($section) {
$qb->andWhere('a.sectionId = :section')->setParameter('section', $section->getId());
}
return $qb->getQuery();
}