php - Laravel 原始查询并包含模型关系

Question

我正在尝试返回带有子查询的单个帖子，以包括反对票和赞成票的计数。我可以通过使用原始查询来实现这一点。

但是这样做意味着我无法再访问后期模型关系，例如评论。

是否有更多 Eloquent 方法可以保持模型关系？

或者是否有更好的方法来解决整个问题？很想听听你会怎么做。

$post = DB::select(
        "SELECT post.*, 
        (SELECT COUNT(*) FROM posts_votes 
        WHERE type = 1 
        AND post_id = posts.id) 
        AS up_votes, 
        (SELECT COUNT(*) FROM posts_votes 
        WHERE type = 2 
        AND post_id = posts.id) 
        AS down_votes 
        FROM posts 
        INNER JOIN posts_votes ON posts.id = posts_votes.post_id
        WHERE posts.id = ?", [$id])[0];

Answer 1

试试这个

Post::select('*')
->addSelect(DB::raw('
    (select count(*) 
    from posts_votes 
    where type = 1 
    and post_id = posts.id) 
    as up_votes
'))
->addSelect(DB::raw('
    (select count(*) 
    from posts_votes 
    where type = 2 
    and post_id = posts.id) 
    as down_votes
'))
->whereIn('id', $ids)
->get();