/**
  * {@inheritdoc}
  */
 public function getQueryBuilder()
 {
     $qb = parent::getQueryBuilder();
     $expression = $qb->expr()->eq('category.enabled', ':enabled');
     $qb->andWhere($expression);
     $qb->setParameter('enabled', true);
     return $qb;
 }
 protected function getConditions()
 {
     $conditions = parent::getConditions();
     $conditions->add(new Eq('enabled', true));
     return $conditions;
 }