Laravel 5.5 - Validate Multiple Form Request - at the same time

Question

The question is already asked here for a previous version of laravel and not yet answered.

I have a html form which is validated using three different

Answer 1

A FormRequest throws an Illuminate\Validation\ValidationException Exception when validation fails which has a redirectTo method, and from there the Exception Handler performs the redirect.

You can achieve your desired behaviour by running your Form Requests manually in your controller within a try/catch block which captures the errors and combines the error bags before redirecting, or if it's essential that you run them by Laravel injecting them into your controller then you would need to add your own exception handler which captures all of the errors, combines them and then redirects after the final Form Request has ran.

However, it's worth noting, both of those approaches aren't great: they're cumbersome and are going to cause you more problems than they solve. You should try to adhere to the Laravel way of doing things as best possible if you'd like to write a maintainable application.

A Form Request exists to validate a form, therefore, each Form should have one Form Request, if you wish to compose a Form Request from different sets of rules then that should be done within the Form Request, e.g:

1. Define your Form Request for your form php artisan make:request StoreMultipleForm

2. From the rules method on StoreMultipleForm fetch the rules for each of the other Form Requests and then return them together, e.g:

   /**
    * Get the validation rules that apply to the request.
    *
    * @return array
    */
   public function rules()
   {
       $formRequests = [
         TransportationRequest::class,
         PurchaseRequest::class,
         SaleRequest::class
       ];
   
       $rules = [];
   
       foreach ($formRequests as $source) {
         $rules = array_merge(
           $rules,
           (new $source)->rules()
         );
       }
   
       return $rules;
   }
   

3. Use the new composed Form Request in your controller, e.g:

   public function store(StoreMultipleForm $request)
   {
       // Do actions here.
   }
   

The advantages of this method are that it's self-contained, it adheres to the one form one Form Request expectation, it doesn't require changes to the Form Requests you're combining and if you need to add additional rules unique to this form you can do so without creating another Form Request.