public function createQuery($alias = '')
 {
     $query = parent::createQuery($alias);
     $query->orderBy($query->getRootAlias() . '.start_date asc');
     $query->addOrderBy($query->getRootAlias() . '.start_time asc');
     return $query;
 }
 public function createQuery($alias = '')
 {
     $query = parent::createQuery($alias);
     $query->orderBy($query->getRootAlias() . '.published_at desc');
     return $query;
 }