Laravel 优雅的 ORM

laravel 子查询方式1：

return Destination::addSelect(['last_flight' => Flight::select('name')
            ->whereColumn('destination_id', 'destinations.id')
            ->orderBy('arrived_at', 'desc')
            ->limit(1)
])->get();

laravel 子查询方式2：

return Destination::addSelect(['last_flight' => function ($query) { 
            $query->select('name')
            ->from('flights')
            ->whereColumn('destination_id', 'destinations.id')
            ->orderBy('arrived_at', 'desc') 
            ->limit(1);
}])->get();