erp/app/Listeners/StockWarning.php

<?php

namespace App\Listeners;

use App\Models\GoodsSku;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Queue\InteractsWithQueue;

class StockWarning implements ShouldQueue
{
    use InteractsWithQueue;

    /**
     * Create the event listener.
     *
     * @return void
     */
    public function __construct()
    {
        //
    }

    public function handle($event)
    {
        $event->goodsSku->status = 2;
        if (0 >= $event->goodsSku->stock) {
            $event->goodsSku->status = 0;
        }
        if (5 < $event->goodsSku->stock) {
            $event->goodsSku->status = 1;
        }
        $event->goodsSku->save();
    }
}