php - symfony/FOSRestBundle : empty JSON response (using the symfony embodied serializer) -

i'm learning build api symfony (using fosrestbundle). i'm following french tutorial. obviously, first try write code myself copy/paste, keeps me empty json array when request appropriate route (rest-api.local/places).

the code works ok if "format" code in php array:

  public function getplacesaction(request $request) {     $places = $this->get('doctrine.orm.entity_manager')             ->getrepository('appbundle:place')             ->findall();     /* @var $places place[] */      $formatted = [];     foreach ($places $place) {         $formatted[] = [            'id' => $place->getid(),            'name' => $place->getname(),            'address' => $place->getaddress(),         ];     }      return new jsonresponse($formatted); } 

but try serialize directly $places, using view handler of fost rest (in config.yml)

fos_rest: routing_loader:     include_format: false view:     view_response_listener: true format_listener:     rules:         - { path: '^/', priorities: ['json'], fallback_format: 'json' } 

and changing function in controller following code, json response without between "{ [],[],[]}" (and have 3 entries in db):

 public function getplacesaction(request $request) {     $places = $this->get('doctrine.orm.entity_manager')             ->getrepository('appbundle:place')             ->findall();     /* @var $places place[] */      return $places; } 

it's first post on stackoverflow, hope question clear, have nice day.

in app/config/services.yml i've added this:

services:     object_normalizer:         class: symfony\component\serializer\normalizer\getsetmethodnormalizer         # important! tag service or wouldn't work         tags:             - { name: serializer.normalizer } 

i still can't why works of sudden i've got nice json in response.