[Doctrine2]如何计算“帖子”的“评论”中的“喜欢”数量

Question

I'm struggling with my own social network where i'm trying to sort the comments of a post by the amount of likes on them. So i made three tables : a Post with many Comments and a Comment with many Likes. Of course, there's a User table to handle all of this.

public function loadProfilePost($user, $first = 0, $limit = 0)
{
    $q =    $this->_em->createQueryBuilder()
            ->select('post, comment')
            ->from('EvoSocialBundle:Post', 'post')
            ->leftJoin('post.comments', 'comment')
            ->where('post.user = :user')
            ->setParameter(':user', $user)
            ->addOrderBy('post.created', 'DESC');

    $q->setFirstResult($first);
    if($limit > 0)
        $q->setMaxResults($limit);

    return $q->getQuery()->getResult();
}

Answer 1

To sort comments by its count of likes you can add one more join in your query builder with likes entity then set group by criteria like group by post.id,comments.id , i have added addSelect() with count function to count the likes for comment and setting the result of count AS HIDDEN so that they will not be returned with the result set and will affect only the query builder part

public function loadProfilePost($user, $first = 0, $limit = 0)
{
    $q =    $this->_em->createQueryBuilder()
            ->select('p, c')
            ->addSelect('COUNT(DISTINCT  c.id) AS HIDDEN total_likes')
            ->from('EvoSocialBundle:Post', 'p')
            ->leftJoin('p.comments', 'c')
            ->leftJoin('c.likes', 'l')
            ->where('p.user = :user')
            ->setParameter(':user', $user)
            ->groupBy('p.id')
            ->addGroupBy('c.id')
            ->orderBy('total_likes','DESC');

    $q->setFirstResult($first);
    if($limit > 0)
        $q->setMaxResults($limit);

    return $q->getQuery()->getResult();
}