laravel request validation rules pass parameter - laravel

Question

I'm going straight to the point here, I am wondering if it is possible to pass a parameter on a validation rule in Laravel.
Here's my code:
I need to pass the $product->id to the ProductUpdateRequest class.
I've read some articles and to no avail can't pass a parameter into it. my other solution was to not use the validation rule class and do the validation directly on the controller by using $request->validate[()]. Since I can access the $product->id on the controller I can easily do the validation. but out of curiosity is there a way for me to pass the $product->id on the validation class?
CONTROLLER
public function update(ProductUpdateRequest $request, Product $product)
{
$request['detail'] = $request->description;
unset($request['description']);
$product->update($request->all());
return response([
'data' => new ProductResource($product)
], Response::HTTP_CREATED);
}
VALIDATION RULE
public function rules()
{
return [
'name' => 'required|max:255|unique:products,name'.$product->id,
'description' => 'required',
'price' => 'required|numeric|max:500',
'stock' => 'required|max:6',
'discount' => 'required:max:2'
];
}
Any suggestions/answers/help would be highly appreciated.

Answer 1

You can get the resolved binding from request
$product = $this->route('product');
Inside your rules method you can get the product instance with the above method.
public function rules()
{
$product = $this->route('product');
return [
'name' => 'required|max:255|unique:products,name'.$product->id,
'description' => 'required',
'price' => 'required|numeric|max:500',
'stock' => 'required|max:6',
'discount' => 'required:max:2'
];
}
It works when you make a function with this Product $product (when you used the Resource route in most cases)
public function update(ProductUpdateRequest $request, Product $product)
{
// code goes here
}
but if you make it like the below it won't work ()
public function update(ProductUpdateRequest $request, $id)
{
// code goes here
}

Answer 2

This is how I would validate unique product name on update. I pass the product ID as a route parameter, the use the unique validation rule to validate that it the product name does't exist in the Database except for this product (id).
class ProductController extends Controller {
public function update(Request $request, $id) {
$this->validate($request, [
'name' => 'required|max:255|unique:products,name'.$id,
]);
// ...
}
}

Answer 3

For custom request in validation rule you can put in your
View :
<input type="hidden" value="product_id">
In Validation Request :
public function rules()
{
$product_id = $this->request->get('product_id');
return [
//
];
}