将请求实例传递给Model Observer，Laravel 5.4

Question

我刚刚了解了模型观察者，并且希望将我的一些逻辑从控制器转移到观察者。这是我所拥有的：

AppServiceProvider.php

public function boot()
{
    WorkOrder::observe(WorkOrderObserver::class);
}

WorkOrderObserver.php

namespace App\Observers;

use App\Site;
use App\WorkOrder;
use Carbon\Carbon;
use App\WorkOrderNumber;

class WorkOrderObserver
{

    public function creating(WorkOrder $workOrder)
    {
        $branchOfficeId = Site::findOrFail($request->site_id)->branch_office_id;
        $today = Carbon::today('America/Los_Angeles');
        $todaysWorkOrderCount = WorkOrder::where('created_at_pst', '>=', $today)->count();

        $workOrder->work_order_number = (new WorkOrderNumber)
            ->createWorkOrderNumber($branchOfficeId, $todaysWorkOrderCount);
        $workOrder->completed_by = null;
        $workOrder->status_id = 1;
        $workOrder->work_order_billing_status_id = 1;
        $workOrder->created_at_pst = Carbon::now()->timezone('America/Los_Angeles')
            ->toDateTimeString();
    }

}

问题是从观察者内部访问请求。我在文档中看不到任何内容。我在这里找到了一个与此相关的线程，并建议使用请求助手功能。我尝试过，request('site_id')但它是空的。

Answer 1

这是如此简单，我有点不好意思发布了。无论如何，万一有人发现了这个线程，这就是解决方案。在观察者中，添加一个接受请求并设置属性的构造函数。

protected $request;

public function __construct(Request $request)
{
    $this->request = $request;
}