如何使moloquent的embedsOne关系工作？

use Jenssegers\Mongodb\Eloquent\Model;

class User extends Model
{
    public function profile()
    {
        return $this->embedsOne(Profile::class);
    }
}

use Jenssegers\Mongodb\Eloquent\Model as Eloquent;
use Jenssegers\Mongodb\Eloquent\Embedded;

class Profile extends Eloquent
{
    use Embedded;

    protected $fillable = ['name', 'age'];
}

$user = User::find(1);
$profile = new Profile(['name' => 'John Doe', 'age' => 25]);

$user->profile()->save($profile); // 保存关联模型

$profile = $user->profile; // 获取关联模型

$user->profile()->update(['name' => 'Jane Doe']); // 更新关联模型

$user->profile()->delete(); // 删除关联模型