Laravel ORM关系，授权用户

Question

我想授权给'卖家'角色的用户。如何为'卖家'提供一个策略，使卖家不能读取其他卖家的订单数据。

我的订单表与4个表有关系。下面是我的订单图

订单模型 [Order.php]

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Order extends Model
{

    public function items()
    {
        return $this->belongsToMany(Product::class, 'order_items','order_id','product_id')->withPivot('quantity','price');
    }

    public function user()
    {
        return $this->belongsTo(User::class);
    }
}

订单策略 [OrderPolicy.php]

<?php

namespace App\Policies;

use App\User;
use App\Order;
use Illuminate\Auth\Access\HandlesAuthorization;

class OrderPolicy
{
    use HandlesAuthorization;

    public function before($user, $ability)
    {
        if ($user->hasRole('admin')) {
            return true;
        }
    }

    public function browse(User $user)
    {
        return $user->hasRole('seller');
    }


    public function read(User $user, Order $order)
    {
        if(empty($order-> )) {
            return false;
        }

        return $user->id == $order-> ;
    }
}