adrema/database/factories/CountryFactory.php

<?php

namespace Database\Factories;

use App\Country;
use Illuminate\Database\Eloquent\Factories\Factory;

class CountryFactory extends Factory
{

    protected $model = Country::class;

    /**
     * Define the model's default state.
     *
     * @return array
     */
    public function definition()
    {
        return [
            'name' => $this->faker->country,
            'nami_id' => $this->faker->randomNumber(),
        ];
    }
}