ldc-startcoq/database/seeders/PromoSeeder.php

<?php

namespace Database\Seeders;

use App\Enums\Promotions\TypeEnum;
use App\Models\Brand;
use App\Models\Promo;
use Illuminate\Database\Seeder;

class PromoSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        $countPromo = 25;
        Promo::factory($countPromo)->create();

        // Seeder for news_product table.
        $brands = Brand::query()->get();
        Promo::each(function (Promo $promo) use ($brands, $countPromo) {
            if ($promo->promotype->value->value === TypeEnum::coBranding->value) {
                $offset = rand(1, $countPromo);
                $length = 1;
                $promo->brands()->saveMany($brands->slice($offset, $length));
            }
        });
    }
}