Symfony2 Doctrine get random product from a category

Question

I have the following database scheme:

table \'products\'
id
category_id

and of course a category table, just with an id.

The data look

Answer 1

Use this helper function:

counters[$class] = (int) $this->manager->createQuery(
            'SELECT COUNT(c) FROM '. $class .' c'
        )->getSingleScalarResult();
    }
    return $em
        ->createQuery('SELECT c FROM ' . $class .' c ORDER BY c.id ASC')
        ->setMaxResults(1)
        ->setFirstResult(mt_rand(0, $counters[$class] - 1))
        ->getSingleResult()
    ;
}

Example usage:

$randomItem = getRandomDoctrineItem($em, 'Application\Entity\Post');