Polymorphic relations between User, Product and Country in Laravel

Country.php

<?php

namespace App\Models;

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

class Country extends Model
{
    use HasFactory;

    protected $fillable = [
        'name',
        'capital',
    ];
  
  public function countryable()
  {
    return $this->morphTo();
  }
}

Product.php

<?php

namespace App\Models;

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

class Product extends Model
{
    use HasFactory;

    protected $fillable = [
        'name',
        'price',
    ];
  
  public function origin()
  {
    return $this->morphOne(Country::class, 'countryable');
  }
}

User.php

<?php

namespace App\Models;

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

class User extends Model
{
    use HasFactory;

    protected $fillable = [
        'firstname',
        'lastname',
    ];
  
  public function nationality()
  {
    return $this->morphOne(Country::class, 'countryable');
  }
}