laravel request validation rules pass parameter

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.

some validation rules like unique, and exists have an option param. Is that what you're referring to? — bmatovu
– bmatovu, Commented Apr 10, 2018 at 5:01
hi @bmatovu here's should be my validation rule return[ 'name' => 'required|max:255|unique:products,name'.$product->id] — Sam Teng Wong
– Sam Teng Wong, Commented Apr 10, 2018 at 5:05

Sachin Sarola · Accepted Answer · 2022-11-28 05:54:25Z

20

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 }

edited Nov 28, 2022 at 5:54

Sachin Sarola

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answered Apr 10, 2018 at 5:00

chanafdo

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7 Comments

chanafdo Over a year ago

Do you get any errors. 'product' should match the route parameter name.

Sam Teng Wong Over a year ago

Hi sir Error: Undefined variable: request

chanafdo Over a year ago

Sorry. My mistake. Change $request to $this

chanafdo Over a year ago

It's route model binding. laravel.com/docs/5.6/routing#route-model-binding

Pathros Over a year ago

This does work! You are the man! :-) (at least in Laravel 5.7)

|

bmatovu · Accepted Answer · 2018-04-10 05:19:52Z

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,
        ]);

        // ...
    }

}

answered Apr 10, 2018 at 5:19

bmatovu

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2 Comments

Sam Teng Wong Over a year ago

Hi sir.. this is my other solution.... but u think it is possible to do it on my Validation Class?

bmatovu Over a year ago

Ohhhh... I was wondering too, you have the solution. The question wasn't as clear. Sorry my validation class, why not just rule a new validation rule, then use your custom validation logic?

Hesam Moosapour · Accepted Answer · 2021-01-17 16:40:58Z

1

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 [
      //
    ];
}

answered Jan 17, 2021 at 16:40

Hesam Moosapour

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