If you want to get a colection of RadmasOpen010Bundle:Service documents, you MUST call the method "toArray" after calling find method from repository or getQuery method from query builder
/**
* @Route("/services.{_format}", defaults={"_format" = "json"})
* @REST\View()
*/
public function getServicesAction($_format){
$services = $this->get('doctrine_mongodb')->getManager()
->getRepository('RadmasOpen010Bundle:Service')
->findAll()->toArray();
return $services;
}
also you can call array_values($services) for correct serialization of exclude strategy