baoshi-was/database/seeds/WorkOrderDetailSeeder.php

<?php

use Illuminate\Database\Seeder;

class WorkOrderDetailSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        $params = factory(\App\WorkOrder::class)->times(30)->make();
        \App\WorkOrder::query()->insert($params);
    }
}