Sulu\Bundle\MediaBundle\Controller\CollectionController::saveEntity PHP Method

    protected function saveEntity($id, Request $request)
    {
        $systemCollectionManager = $this->get('sulu_media.system_collections.manager');
        $parent = $request->get('parent');
        if ($id !== null && $systemCollectionManager->isSystemCollection(intval($id)) || $parent !== null && $systemCollectionManager->isSystemCollection(intval($parent))) {
            throw new AccessDeniedException('Permission "update" or "create" is not granted for system collections');
        }
        try {
            $collectionManager = $this->getCollectionManager();
            $data = $this->getData($request);
            $data['id'] = $id;
            $data['locale'] = $this->getRequestParameter($request, 'locale', true);
            $collection = $collectionManager->save($data, $this->getUser()->getId());
            $view = $this->view($collection, 200);
        } catch (CollectionNotFoundException $e) {
            $view = $this->view($e->toArray(), 404);
        } catch (MediaException $e) {
            $view = $this->view($e->toArray(), 400);
        }
        return $this->handleView($view);
    }