Forward an action

[Sybio]

In my case the front app calls multiple times POST /chapters.

Sometimes, chapters already exist for given unique property $chapter->position and I would like to update and redirect to PUT instead of returning an error saying the object already exists. I want to implement this behavior to prevent too many calls (If /POST refused, currently need to call /PUT, multiple times...).

And to avoid duplicate code or process, i don't want to design custom code to update or save my object $chapter, i want to delegate to native routes POST or PUT that are already configured (with annotations, groups and validators).

So my question, is there a way to forward an Api platform action in a custom controller (or action), like that :

// ...
class AuditChaptersSaveForAuditAndChapterController extends Controller
{
    /**
     * @Route(
     *     name="api_chapters_save_at_pos",
     *     path="/audit_chapters/save_at_pos/{position}"
     * )
     * @Method("POST")
     * @return Response
     */
    public function createOrUpdateAction(Request $request, $position)
    {
        $request->attributes->add([
            '_api_resource_class' => Chapter::class,
        ]);

       // If chapter already exists at $position
       if ($chapter = $chapterRepository->findOneByPosition($position)) {
           // Forward native PUT action to update the existing chapter
          $response = $this->forward('api_platform.action.put_item', [
                'request' => $request,
                'id' => $chapter->getId(),
          ]);
       } else {
            // Else forward POST action to create new one
            $response = $this->forward('api_platform.action.post_collection', [
                'request' => $request,
            ]);
       }

        return $response;
    }
}

I tried above code without success, got :

Controller "ApiPlatform\Core\Action\PlaceholderAction" requires that you provide a value for the "$data" argument. Either the argument is nullable and no null value has been provided, no default value has been provided or because there is a non optional argument after this one.

Please note I found interesting stuff for previous API Platform versions, like #477 (comment) and #477 (comment)

But neither ResourceController or DunglasApiBundle still exist on v2.1.3.

[soyuka]

If it exists already you should have a unique identifier and call PUT /api/chapters/X.

IMO the client should take care of this.

[Sybio]

Thanks for reply, ok I should still continue using /POST then /PUT on validation fail...

But let's say I want to forward an Api platform action in a custom action, how can i do ?

[Simperfit]

You can redirect in an event subscribers if you want to, but like @soyuka said it's better to let the client handle this kind of things.