Additional/app/Models/Product.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Str;

class Product extends Model
{
    protected $fillable = [
        'category_id',
        'name',
        'slug',
        'description',
        'price',
        'image',
        'stock',
        'featured',
        'type'
    ];

    protected static function boot()
    {
        parent::boot();

        static::creating(function ($model) {
            if (empty($model->slug)) {
                $model->slug = Str::slug($model->name);
            }
        });

        static::updating(function ($model) {
            if (empty($model->slug)) {
                $model->slug = Str::slug($model->name);
            }
        });
    }

    public function category()
    {
        return $this->belongsTo(Category::class);
    }

    public function orderItems()
    {
        return $this->hasMany(OrderItem::class);
    }

    public function printStocks()
    {
        return $this->belongsToMany(PrintStock::class, 'product_print_stocks');
    }

    public function images()
    {
        return $this->hasMany(ProductImage::class)->orderBy('sort_order');
    }

    public function getRouteKeyName()
    {
        return 'slug';
    }
}