public function findSubjects(Category $category, $getQuery = false)
    {
        $dql = "
            SELECT s.id as id,
            COUNT(m_count.id) AS count_messages,
            MAX(m.creationDate) AS last_message_created,
            s.id as subjectId,
            s.title as title,
            s.isSticked as isSticked,
            s.author as subject_author,
            subjectCreator.lastName as subject_creator_lastname,
            subjectCreator.firstName as subject_creator_firstname,
            subjectCreator.id as subject_creator_id,
            lastUser.lastName as last_message_creator_lastname,
            lastUser.firstName as last_message_creator_firstname,
            s.creationDate as subject_created,
            s.isClosed as is_closed
            FROM Claroline\ForumBundle\Entity\Subject s
            JOIN s.messages m_count
            JOIN s.creator subjectCreator
            JOIN s.category category
            JOIN s.messages m
            JOIN m.creator lastUser WITH lastUser.id =
                (
                    SELECT lcu.id FROM Claroline\ForumBundle\Entity\Message m2
                    JOIN m2.subject s2
                    JOIN m2.creator lcu
                    JOIN s2.category c2
                    WHERE NOT EXISTS
                    (
                        SELECT m3 FROM Claroline\ForumBundle\Entity\Message m3
                        JOIN m3.subject s3
                        WHERE s2.id = s3.id
                        AND m2.id < m3.id
                    )
                    and c2.id = :categoryId
                    and m2.id = m.id
                )
            WHERE category.id = :categoryId
            GROUP BY s.id, subjectCreator.lastName, subjectCreator.firstName, lastUser.lastName, lastUser.firstName
            ORDER BY isSticked DESC, last_message_created DESC
        ";
        $query = $this->_em->createQuery($dql);
        $query->setParameter('categoryId', $category->getId());

        return ($getQuery) ? $query: $query->getResult();
    }