Doing a subquery inside a where with Doctrine 2 querybuilder - symfony

Question

I am trying (without success) to translate this SQL query inside a Doctrine2 querybuilder. How should I do to include the subselect inside a Where with Querybuilder ?
SQL query I am trying to implement with querybuilder :
SELECT * FROM `message` A
WHERE A.id =
(SELECT B.id FROM `message` B
WHERE (A.user_id = B.user_id AND A.receiver_id = B.receiver_id) OR (A.user_id = B.receiver_id AND A.receiver_id = B.user_id)
ORDER BY creationdate DESC
LIMIT 1)
So far, I tried something like this in Message repository but I guess I am far away from the good way to do it :
public function getConversations()
{
$qb = $this
->createQueryBuilder('A')
->Where('A.id IN
(SELECT B.id FROM Message B
WHERE (A.user_id = B.user_id AND A.receiver_id = B.receiver_id) OR (A.user_id = B.receiver_id AND A.receiver_id = B.user_id)
ORDER BY creationdate DESC
LIMIT 1')
;
return $qb
->getQuery()
->getResult()
;
}
}
This trigger error message:
Error: Class 'Message' is not defined.

Answer 1

For people interested I finally found a solution. I did the query like this (if someone has another solution I am very interested):
public function getConversations()
{
$rawSql = "SELECT * FROM `message` A
WHERE A.id =
(SELECT B.id FROM `message` B
WHERE (A.user_id = B.user_id AND A.receiver_id = B.receiver_id) OR (A.user_id = B.receiver_id AND A.receiver_id = B.user_id)
ORDER BY creationdate DESC
LIMIT 1)
";
$stmt = $this->getEntityManager()->getConnection()->prepare($rawSql);
$stmt->execute([]);
return $stmt->fetchAll();
}