Laravel自定义错误，模型注入控制器

Question

So I was coming across a problem which I haven't exactly been able to resolve and having no idea where I should start with this.

I know Laravel has a nice findOrFail() function but I seem to be unable to use that in my case. So for example I have a route as follow:

Route::get('user/{user}', 'UserController@show);

My controller

public function show(User $user)
{
    //never reaches this section 
}

Now this would normally work, but if the record does not exists Laravel throws the error before I get inside the function. Is there a nice and easy way of catching the error without changing my function to

public function show($id)
{
    $user = User::findOrFail($id)
}

I find it much nicer to have the user class in my function parameter and wish not to remove it there.

Answer 1

Per the Laravel Docs for Route Model Binding (scroll down to the 'Customizing The "Not Found" Behavior' heading):

If you wish to specify your own "not found" behavior, pass a Closure as the third argument to the model method:

$router->model('user', 'App\User', function () {
    throw new NotFoundHttpException;
});

Earlier they specify where to place that code:

You should define your model bindings in the RouteServiceProvider::boot method.