public function country($country_id, Request $request = null)
    {
        $country = Country::with('zone')->find($country_id);

        if ($request) {
            $included = [];
            $query = $country->getInlcudeResources($request->include);
            if ($query) {
                $collection = new Collection(
                    $query,
                    str_singular($request->include)
                );
                $included = $collection->toArray();
            }
            $links = $request ? ['self' => $request->url()] : [];
            return $this->respondWithItem(
                $country,
                'country',
                $links,
                $included
            );
        }
        return $country;
    }