How to write validation rule with resource in Laravel? - php

Question

I use Laravel 8 with Resource to define routes in api.php and DestroyProductRequest in my controller:
Route::resources([
'product' => ProductController::class,
]);
In the controller:
public function destroy(DestroyProductRequest $request, Product $product) {
$product->delete();
return Response::HTTP_OK;
}
In the DestroyProductRequest.php:
public function rules() {
return [
'id' => 'required|integer|exists:products,id',
];
}
Now the key is the Route::resource convert the incoming id from the url into a model. But now how can I write the correct rule in the the rules() function?
Now it sais id: ["The id field is required."] in the error response.
Any idea?

Answer 1

By default Laravel does not validate the route parameters.
You have add custom logic in order to work
public function rules()
{
return [
'product' => 'required|integer|exists:products,id',
];
}
protected function validationData()
{
// Add the Route parameters to you data under validation
return array_merge($this->all(),$this->route()->parameters());
}
In a normal use case, you wouldn't validate route request. Laravel would return a 404 Not Found exception. Which is a standard and appropriate response.

Answer 2

Since you are using the resource, the route parameter is implicit biding key (product id), So Laravel bind the passed id as product implicitly. Change your Rules code segment as following,
public function rules() {
return [
'product' => 'required|integer|exists:products,id',
];
}
public function destroy(Product $product) {
$product->delete();
return Response::HTTP_OK;
}
If you wanna add ACL
if ($user->can('destroy', $product)) {
$product->delete();
return Response::HTTP_OK;
}

Answer 3

use Validator for your question
use Illuminate\Support\Facades\Validator;
public function destroy(DestroyProductRequest $request, Product $product) {
$rules = [
'id' => 'required|integer|exists:products,id',
];
$messages = [
'id.required' => 'The id field is required.',
'id.integer' => 'The id field need to be integer.',
'id.exists' => 'The id field is exists.',
];
Validator::make($request->all(), $rules, $messages)->validate();
$product->delete();
return Response::HTTP_OK;
}
Read more here: https://laravel.com/docs/8.x/validation