ldc-mesbr-app/app/Models/BasketContent.php

<?php

namespace App\Models;

use App\Models\Coupon;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\HasOne;

class BasketContent extends Model
{
    use HasFactory;

    /**
     * booted method
     *
     * @return void
     */
    protected static function booted()
    {
        static::creating(function (self $model) {
            $model->printed = 0;
        });
    }

    /**
     * Basket model relation
     * @return HasOne
     */
    public function basket()
    {
        return $this->hasOne(Basket::class);
    }

    /**
     * Coupon model relation
     * @return HasOne
     */
    public function coupon()
    {
        return $this->hasOne(Coupon::class, 'coupon_id', 'coupon_id');
    }
}