snipe-it/database/factories/CompanyFactory.php

<?php

namespace Database\Factories;

use App\Models\Company;
use Illuminate\Database\Eloquent\Factories\Factory;

class CompanyFactory extends Factory
{
    /**
     * The name of the factory's corresponding model.
     *
     * @var string
     */
    protected $model = Company::class;

    /**
     * Define the model's default state.
     *
     * @return array
     */
    public function definition()
    {
        return [
            'name' => $this->faker->unique()->company(),
            'created_by' => 1,
            'notes' => 'Created by DB seeder',
            'tag_color' => $this->faker->hexColor(),
        ];
    }

    public function childOf(Company $parent): static
    {
        return $this->state(['parent_id' => $parent->id]);
    }
}