baoshi-was/app/Services/WorkOrderDetailService.php

<?php

namespace App\Services;

 use App\Traits\ServiceAppAop;
use App\WorkOrderDetail;

class WorkOrderDetailService
{
    use ServiceAppAop;
    protected $modelClass=WorkOrderDetail::class;

    public function createWorkOrderDetail($workOrder,$params)
    {
        $param  = (new WorkOrderDetail($params))->getAttributes();
        $workOrder->details()->create($param);
        $workOrder->loadMissing('details');
    }

}