public function updateActionPost() : object
    {
        $response = $this->di->get("response");
        $request = $this->di->get("request");
        $session = $this->di->get("session");
        $key = $request->getPost("stylechooser");

        if ($key === "none") {
            $session->set("flashmessage", "Unsetting the style and using deafult style.");
            $session->set(self::$key, null);
        } elseif (array_key_exists($key, $this->styles)) {
            $session->set("flashmessage", "Using the style '$key'.");
            $session->set(self::$key, $key);
        }

        return $response->redirect("style");
    }