Laravel 4 查询生成器 - 具有复杂的左连接

我是 Laravel 4 的新手。

我有这样的疑问：

SELECT a.id, active, name, email, img_location, IFNULL(b.Total, 0) AS LeadTotal, IFNULL(c.Total, 0) AS InventoryTotal
FROM users AS a
LEFT JOIN (
   SELECT user_id, count(*) as Total
   FROM lead_user
   GROUP BY user_id
) AS b ON a.id = b.user_id
LEFT JOIN (
   SELECT user_id, count(*) as Total
   FROM user_inventory
   GROUP BY user_id
) AS c ON a.id = c.user_id
WHERE a.is_deleted = 0

如何将其转换为 Laravel 查询生成器？我对如何将 Laravel 连接查询生成器与此类查询一起使用感到困惑。

Answer!!

希望 Laravel 论坛上 petkostas 的帮助。我们得到了答案。

$users = DB::table('users AS a')
->select(array('a.*', DB::raw('IFNULL(b.Total, 0) AS LeadTotal'), DB::raw('IFNULL(c.Total, 0) AS InventoryTotal')  ) )
->leftJoin(DB::raw('(SELECT user_id, COUNT(*) as Total FROM lead_user GROUP BY user_id) AS b'), function( $query ){
    $query->on( 'a.id', '=', 'b.user_id' );
})
->leftJoin(DB::raw('(SELECT user_id, COUNT(*) as Total FROM user_inventory WHERE is_deleted = 0 GROUP BY user_id) AS c'), function( $query ){
    $query->on( 'a.id', '=', 'c.user_id' );
})
->where('a.is_deleted', '=', 0)
->get();

我相信这应该有效：

$users = DB::table('users')
    ->select( array('users.*', DB::raw('COUNT(lead_user.user_id) as LeadTotal'), DB::raw('COUNT(user_inventory.user_id) as InventoryTotal') ) )
    ->leftJoin('lead_user', 'users.id', '=', 'lead_user.user_id')
    ->leftJoin('user_inventory', 'users.id', '=', 'user_inventory.user_id')
    ->where('users.is_deleted', '=', 0)
    ->get();