How to make a custom FormRequest error response in Laravel 5.5

I did the obligatory composer dump autoload and artisan clear compiled which did not help with the ReflectionException.

I had same problem.

I solved it by adding to app/http/exceptions/Handler.php file render function following lines.

if ($exception instanceof \Illuminate\Validation\ValidationException) { return new JsonResponse($exception->errors(), 422); }

I dont know if this is correct way but seems to work.

Good idea.

The "old" way was more flexible and less centralized. But this definitely works.

From the upgrade documentation:

A Note On Form Requests

If you were customizing the response format of an individual form request, you should now override the failedValidation method of that form request, and throw an HttpResponseException instance containing your custom response:

use Illuminate\Http\Exceptions\HttpResponseException;

/**
 * Handle a failed validation attempt.
 *
 * @param  \Illuminate\Contracts\Validation\Validator  $validator
 * @return void
 *
 * @throws \Illuminate\Validation\ValidationException
 */
protected function failedValidation(Validator $validator)
{
    throw new HttpResponseException(response()->json(..., 422));
}

That is nice, however as written in OP I get a ReflectionException in RouteSignatureParameters.php that the inheriting request class does not exist.

E.g: MyExampleRequest extends MyApiRequest extends FormRequest

MyApiRequest overrides failedValidation

ReflectionException: MyExampleRequest does not exist in RouteSignatureParameters.php

Edit: Tried it with overriding in MyExampleRequest directly, same exception.

I also tried to override failedValidation method. Got same ReflectionException in RouteSignatureParameters. Could not get it to work no matter what i did. Had to think alternative way around it :)

Hey CU256,

I think this might help, after trying clay's approach, at first it didn't work (kept on getting the ReflectionException). That was because I was using the:

use Illuminate\Support\Facades\Validator;

So i changed it to:

use Illuminate\Contracts\Validation\Validator;

and my override method is:

protected function failedValidation(Validator $validator) { throw new HttpResponseException(response()->json($validator->errors(), 422)); }

Hope it helps.

@Michaelisah That was it, thank you!

After the updation of laravel documentation, you don't need to override the response() anymore, all you have to do is, just write your bussiness logics inside the protected failedValidation() inside your custom FormRequest class like follows,

    use Illuminate\Http\Exceptions\HttpResponseException;
    use Illuminate\Contracts\Validation\Validator;

    /**
    * [failedValidation [Overriding the event validator for custom error response]]
    * @param  Validator $validator [description]
    * @return [object][object of various validation errors]
    */
    public function failedValidation(Validator $validator) { 
         //write your bussiness logic here otherwise it will give same old JSON response
        throw new HttpResponseException(response()->json($validator->errors(), 422)); 
    }