Checking route parameters are a specific value?

Question

My route:

Route::get('/{type?}/{filter?}', [IndexController::class, 'index']);

Is there a way, like form requests, where I can check that $type and $filter are specific values, for example $filter is equal to new or perhaps trending?

I've considered just specifying the finite number of options as routes themselves:

Route::get('/books/new', [IndexController::class, 'index']);

But I am then unable to get these params in the controller. Please note, I do not wish to have separate controllers for each $type.

Answer 1

You can constrain the route parameter to a regular expression, as explained in the documentation.

Route::get('/{type?}/{filter?}', [IndexController::class, 'index'])
    ->where(['filter' => '^(new|trending)$']);

But I think it would make more sense to keep this logic centralised in your controller:

public function index(string $type, string $filter)
{
    switch ($type) {
        case "books":
            // do something
            break;
        case "films":
            // do something
            break;
        default:
            abort(404);
    }
}