public function putMetadataAction(Page $page, Request $request)
    {
        $metadatas = $this->application
                ->getContainer()
                ->get('nestednode.metadata.resolver')
                ->resolve($page);

        foreach ($request->request->all() as $name => $attributes) {
            if ($metadatas->has($name)) {
                foreach ($attributes as $attr_name => $attr_value) {
                    if ($attr_value !== $metadatas->get($name)->getAttribute($attr_name)) {
                        $metadatas->get($name)->setAttribute($attr_name, $attr_value, null, false);
                    }
                }
            }
        }

        $page->setMetaData($metadatas);
        $this->getApplication()->getEntityManager()->flush();

        return $this->createJsonResponse(null, 204);
    }