public function addCollection(self $collection)
    {
        // we need to remove all routes with the same names first because just replacing them
        // would not place the new route at the end of the merged array
        foreach ($collection->all() as $name => $route) {
            unset($this->routes[$name]);
            $this->routes[$name] = $route;
        }

        foreach ($collection->getResources() as $resource) {
            $this->addResource($resource);
        }
    }