Doctrine 2 - Beware of lazy loading when querying entities with associations

doctrine--lazy-loading-collections-best-practice.php

<?php

//$em is the entity manager
$qb = $em->createQueryBuilder();

$qb
    ->select('Article', 'Comment')
    ->from('Entity\Article', 'Article')
    ->leftJoin('Article.comment', 'Comment')
;

$query = $qb->getQuery();

return $query->getResult();