<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class ProductGift extends Model
{
    /**
     * @var array
     */
    protected $fillable = [
        'sku_id',
        'gift_sku_id',
        'limit',
        'num',
        'sent',
        'remaining',
    ];

    /**
     * 赠送的商品 SKU
     */
    public function giftSku()
    {
        return $this->belongsTo(ProductSku::class, 'gift_sku_id');
    }

    /**
     * 确认此赠品是否有限制
     *
     * @return bool
     */
    public function isLimit(): bool
    {
        return $this->limit !== 0;
    }
}