Howto reusing Form Request inside loop - laravel

Question

I am making a "/bulk" endpoint for my API/REST made in Laravel 8.
My problem is that I don't know how to reuse the same FormRequest that I have for the create or update
json post to: /cars/bulk
{
"cars": [{"model": "A", "year": 2021, "plate": "AA11BB"},{"model": "B", "year": 2021, "plate": "AA12BB"},{"model": "C", "plate": "AA13BB"}]
}
// CarController.php
public function store(CarRequest $request)
{
$car = $this->carService->store($request, Car::class);
}
public function update(CarRequest $request, Car $car)
{
$this->carService->update($request, $car);
}
public function bulk(Request $request)
{
$this->carService->bulk($request);
}
// CarService.php
public function store($request, $modelClass)
{
# My code....
}
public function update($request, $model)
{
# My code....
}
public function bulk($request)
{
foreach ($request->cars AS $carData )
{
$car = Car::where('plate','=',$carData->plate)->first()
# here is the problem,
# howto validate each $car by reusing CarRequest
if ($car){
$this->update($carData, $car);
} else {
$this->store($carData, Car::class);
}
}
}
This is de form request for each item, i have use to for bulk or one request
class CarRequest extends BaseRequest
{
public function authorize()
{
$this->setModel(Car::class);
return $this->isAuthorized();
}
public function rules()
{
$this->setModel(Car::class);
$rules = parent::rules();
$rules = [
'model' => 'required',
'year' => 'required|numeric',
'plate' => 'required'
];
return $rules;
}
public function messages()
{
# multiples messages
}
}
I need reuse my request
Edit: add form request

Answer 1

So I wouldn't suggest using it within a loop how you have in your example, what would be better would be to create a second, bulk request that valiates an array like this.
public function rules()
{
$this->setModel(Car::class);
$rules = parent::rules();
$rules = [
'cars' => ['required', 'array'],
'cars.*.model' => 'required',
'cars.*.year' => 'required|numeric',
'cars.*.plate' => 'required'
];
return $rules;
}

Answer 2

You can do it with same CarRequest form request class as follows.
public function rules()
{
return[
'cars.*.model' => 'required',
'cars.*.year' => 'required',
'cars.*.plate' => 'required',
];
}
Laravel will expect that you are sending nested array. If you dont want to mix it up with CarRequest you can do it with creating another FormRequest class.