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所以我正在使用 querybuilder 构建一个查询，在该查询中，我需要计算一个连接表中的行，该连接表具有来自另一个表的 where 条件。我最终无法加入该表，因为它会导致将错误的行与此特定联接进行比较。我认为高级连接子句将允许在它自己的范围内添加另一个连接，但情况似乎并非如此。

这是我尝试过的：

$profile = DB::table('users')
      ->select('users.username', 'users.profile_picture', 'users.screen_state',
      'count(replies.id) as replies', 'count(interactions.id) as interactions',
      'count(alerts.id) as alerts', 'count(user__followers.id) as followers',
      'count(user__following.id) as following', 'count(following.id) as volgend')
      ->leftJoin('replies', function($join)
      {
        $join->on('users.id', '=', 'replies.user_id')
          ->leftJoin('alerts')
          ->on('replies.alert_id', '=', 'alerts.id')
          ->where('replies.user_id', '=', $user->id)
          ->where('alerts.hide', '=', 0);
      })
      ->leftJoin('interactions', function($join)
      {
        $join->on('users.id', '=', 'interactions.user_id')
          ->leftJoin('alerts')
          ->on('interactions.alert_id', '=', 'alerts.id')
          ->where('interactions.user_id', '=', $user->id)
          ->where('alerts.hide', '=', 0);
      })
      ->leftJoin('alerts', function($join)
      {
        $join->on('users.id', '=', 'alerts.user_id')
          ->where('alerts.user_id', '=', $user->id)
          ->where('alerts.hide', '=', 0);
      })
      ->leftJoin('user__followers as user__following', function($join)
      {
        $join->on('users.id', '=', 'user__followers.user_id')
          ->where('user__followers.user_id', '=', $user->id)
          ->where('user__followers.follower_id', '=', $searchid);
      })
      ->leftJoin('user__followers as following', function($join)
      {
        $join->on('users.id', '=', 'user__followers.user_id')
          ->where('user__followers.user_id', '=', $user->id);
      })
      ->leftJoin('user__followers', function($join)
      {
        $join->on('users.id', '=', 'user__followers.user_id')
          ->where('user__followers.follower_id', '=', $user->id);
      })
      ->where('users.id', '=', $user->id)
      ->get();

我在原始 sql 中也有这个查询，所以你可以看到我想要实现的目标：

            SELECT u.username, u.profile_picture, u.screen_state,
            (SELECT count(DISTINCT r.id)
                FROM `reply` r
                LEFT JOIN alerts a
                ON r.alert_id = a.alert_content_id
                WHERE r.user_id = :userid AND a.hide=0)
                    AS replies,
            (SELECT count(DISTINCT i.id)
                FROM `interactions` i
                LEFT JOIN alerts a
                ON i.alert_id = a.alert_content_id
                WHERE i.user_id = :userid AND a.hide=0)
                    AS interactions,
            (SELECT count(DISTINCT a.alerts)
                FROM `alerts` a
                WHERE a.user_id = :userid AND a.hide=0)
                    AS alerts,
            (SELECT count(DISTINCT uf.id)
                FROM `user_followers` uf
                WHERE uf.user_id = :userid
                AND uf.follower_id = :searchid)
                    AS following,
            (SELECT count(DISTINCT uf.id)
                FROM `user_followers` uf
                WHERE uf.user_id = :userid)
                    AS volgend,
            (SELECT count(DISTINCT uf.id)
                FROM `user_followers` uf
                WHERE uf.follower_id = :userid)
                    AS followers
                FROM users u
            WHERE id = :userid GROUP BY id

但这给了我一个错误：

Call to undefined method Illuminate\Database\Query\JoinClause::leftJoin()

所以我的问题是如何加入一个表并检查另一个表中的条件？

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