laravel-shop/app/Models/UserAddress.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class UserAddress extends Model
{
    use HasFactory;

    protected $fillable=[
        'province','city','district','address','zip','contact_name','contact_phone','last_userd_at'
    ];

    protected $dates=['last_used_at'];

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

    public function getFullAddressAttribute(){
        return "{$this->province}{$this->city}{$this->district}{$this->address}";
    }

}