Laravel 在请求中检索绑定模型
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Laravel retrieve binded model in Request
提问by Phil Cross
Is there any easy way of retrieving the route binded model within a Request?
是否有任何简单的方法可以在请求中检索路由绑定模型？
I want to update a model, but before I do, I want to perform some permissions checks using the Requests authorize()method. But I only want the owner of the model to be able to update it.
我想更新模型，但在此之前，我想使用 Requestsauthorize()方法执行一些权限检查。但我只希望模型的所有者能够更新它。
In the controller, I would simply do something like this:
在控制器中，我会简单地做这样的事情：
public function update(Request $request, Booking $booking)
{
if($booking->owner->user_id === Auth::user()->user_id)
{
// Continue to update
}
}
But I'm looking to do this within the Request, rather than within the controller. If I do:
但我希望在请求中执行此操作，而不是在控制器中执行此操作。如果我做：
dd(Illuminate\Http\Request::all());
It only gives me the scalar form properties (such as _methodand so on, but not the model).
它只给我标量形式的属性（例如_method等等，而不是模型）。
Question
题
If I bind a model to a route, how can I retrieve that model from within a Request?
如果我将模型绑定到路由，如何从请求中检索该模型？
Many thanks in advance.
提前谢谢了。
回答by Martin Bean
Absolutely! It's an approach I even use myself.
绝对地！这是我什至自己使用的方法。
You can get the current route in the request, and then any parameters, like so:
您可以在请求中获取当前路由，然后获取任何参数，如下所示：
class UpdateRequest extends Request
{
public function authorize()
{
$booking = $this->route('booking');
return $booking->owner->user_id == $this->user()->getKey();
}
}
Unlike smartman's (now deleted) answer, this doesn't incur another find query if you have already retrieved the model via route–model binding.
与smartman的（现已删除）答案不同，如果您已经通过路由-模型绑定检索了模型，这不会引发另一个查找查询。
回答by godbout
Once you did your explicit binding (https://laravel.com/docs/5.5/routing#route-model-binding) you actually can get your model directly with $this.
一旦您进行了显式绑定（https://laravel.com/docs/5.5/routing#route-model-binding），您实际上可以直接使用 $this 获取您的模型。
class UpdateRequest extends Request
{
public function authorize()
{
return $this->booking->owner->user_id == $this->booking->user()->id;
}
}
Even cleaner!
更干净！
回答by Andrew Ellis
To add on to Martin Bean's answer, you can access the bound instance using just route($param):
要添加Martin Bean的答案，您可以仅使用以下命令访问绑定实例route($param)：
class UpdateRequest extends Request
{
public function authorize()
{
$booking = $this->route('booking');
return $booking->owner->user_id == $this->user()->id;
}
}
Note:This works in Laravel 5.1. I have not tested this on older versions.
注意：这适用于 Laravel 5.1。我没有在旧版本上测试过这个。
