<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class ShoppingCartItem extends Model
{
    /**
     * @var array
     */
    protected $casts = [
        'quantity' => 'int',
    ];

    /**
     * @var array
     */
    protected $fillable = [
        'user_id',
        'sku_id',
        'quantity',
    ];

    /**
     * 此购物车物品所属的商品
     */
    public function sku()
    {
        return $this->belongsTo(ProductSku::class);
    }
}