PartKeepr\PartBundle\Controller\PartController::massRemoveStockAction PHP Method

    public function massRemoveStockAction(Request $request)
    {
        $removals = json_decode($request->get('removals'));
        if (!is_array($removals)) {
            throw new \Exception('removals parameter must be an array');
        }
        /**
         * @var IriConverter
         */
        $iriConverter = $this->get('api.iri_converter');
        $user = $this->get('partkeepr.userservice')->getUser();
        foreach ($removals as $removal) {
            if (!property_exists($removal, 'part')) {
                throw new \Exception('Each removal must have the part property defined');
            }
            if (!property_exists($removal, 'amount')) {
                throw new \Exception('Each removal must have the amount property defined');
            }
            /**
             * @var Part
             */
            $part = $iriConverter->getItemFromIri($removal->part);
            $stock = new StockEntry();
            $stock->setStockLevel(0 - intval($removal->amount));
            $stock->setUser($user);
            if (property_exists($removal, 'comment')) {
                $stock->setComment($removal->comment);
            }
            $part->addStockLevel($stock);
        }
        $this->get('doctrine.orm.entity_manager')->flush();
    }