Laravel 5.2 Create function -

i've been building basic laravel crud system, i've made basic create funciton want make if record exists in database , u create same record again integer u put in create form add's existing record example: u have stock system product has ammount of 50, , u create same product ammount of 40, , 40 add's 50 in database 90. im not entirely sure how so.

this store function i've made application:

 public function store(request $request) {     // aantal = ammount (int)     //producten_id = foreign_key producten database table     //locaties_id = foreign_key locaties database table     voorraad::create($request->only(['aantal', 'producten_id', 'locaties_id']));     //var_dump($request);     return redirect(route('voorraad.index')); } 

if u need more information let me know , i'll add question

assuming set default value field in database structure, simple as:

$voorraad = voorraad::firstorcreate($request->only(['producten_id', 'locaties_id']);  $voorraad->increment('aantal', $request->aantal); 

if want set default amount new products in controller instead:

$voorraad = voorraad::firstorcreate($request->only(['producten_id', 'locaties_id']);  if (! $voorraad->aantal) {    $voorraad->aantal = 123; // default } else {    $voorraad->aantal += $request->aantal; }  $voorraad->save(); 

generally speaking firstorcreate method fetches database record passed attributes if exists or otherwise creates it. see in laravel docs.

if have questions ask in comments, i'll happy explain.