Rest API - Why is Postman sending me back empty curly brackets with GET - rest

Question

I'm working on a REST API. Hence I created my entities like for example this one musee.php
<?php
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* Musee
*
* #ORM\Table(name="musee")
* #ORM\Entity(repositoryClass="AppBundle\Repository\MuseeRepository")
*/
class Musee
{
/**
* #var int
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue
*/
private $id;
/**
* #var string
*
* #ORM\Column(type="string", nullable=false)
*/
private $nom;
/**
* #var string
*
* #ORM\Column(type="string", nullable=false)
*/
private$adresse;
/**
* #var integer
*
* #ORM\Column(type="integer", nullable=false)
*/
private $horaireOuverture;
/**
* #var integer
*
* #ORM\Column(type="integer", nullable=false)
*/
private $horaireFermeture;
/**
* #ORM\OneToMany(targetEntity="AppBundle\Entity\Bateau", mappedBy="musee")
* #ORM\JoinColumn(referencedColumnName="id")
*/
private $bateaux;
/**
* #return int
*/
public function getId()
{
return $this->id;
}
/**
* #param int $id
*/
public function setId($id)
{
$this->id = $id;
}
/**
* #return string
*/
public function getNom()
{
return $this->nom;
}
/**
* #param string $nom
*/
public function setNom($nom)
{
$this->nom = $nom;
}
/**
* #return string
*/
public function getAdresse()
{
return $this->adresse;
}
/**
* #param string $adresse
*/
public function setAdresse($adresse)
{
$this->adresse = $adresse;
}
/**
* #return int
*/
public function getHoraireOuverture()
{
return $this->horaireOuverture;
}
/**
* #param int $horaireOuverture
*/
public function setHoraireOuverture($horaireOuverture)
{
$this->horaireOuverture = $horaireOuverture;
}
/**
* #return int
*/
public function getHoraireFermeture()
{
return $this->horaireFermeture;
}
/**
* #param int $horaireFermeture
*/
public function setHoraireFermeture($horaireFermeture)
{
$this->horaireFermeture = $horaireFermeture;
}
/**
* #return mixed
*/
public function getBateaux()
{
return $this->bateaux;
}
/**
* #param mixed $bateaux
*/
public function setBateaux($bateaux)
{
$this->bateaux = $bateaux;
}
}
My MuseeRepository also exists and in my config.yml I put (both were installed with composer) :
# Nelmio CORS
nelmio_cors:
defaults:
allow_credentials: false
allow_origin: ['*']
allow_headers: ['Content-Type']
allow_methods: ['POST', 'PATCH', 'GET', 'DELETE', 'OPTIONS']
max_age: 3600
paths:
'^/api':
# FosRest
fos_rest:
routing_loader:
include_format: false
view:
view_response_listener: true
format_listener:
rules:
- { path: '^/', priorities: ['json'], fallback_format: 'json' }
In my MuseeController here is what I put:
<?php
/**
* Created by PhpStorm.
* User: Fanny
* Date: 28/03/2018
* Time: 16:13
*/
namespace AppBundle\Controller;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use FOS\RestBundle\Controller\Annotations as Rest;
use FOS\RestBundle\Controller\FOSRestController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use FOS\RestBundle\View\View;
use AppBundle\Entity\Musee;
class MuseeController extends Controller
{
/**
* #Rest\View(serializerGroups={"musee"})
* #Rest\Get("/musee")
*/
// Fonction qui renvoie toutes all musee
public function findMusee()
{
$musee = $this->getDoctrine()
->getRepository('AppBundle:Musee')
->findAll();
return $musee;
}
}
I also used a serializer file, I wonder if my problem does not come from there... Though all this elements are in my database as I generated it with doctrine.
AppBundle\Entity\Musee:
attributes:
id:
groups: ['musee']
nom:
groups: ['musee']
adresse:
groups: ['musee']
horaire_ouverture:
groups: ['musee']
horaire_fermeture:
groups: ['musee']
bateaux:
groups: ['musee']
My problem is when I try to call my localhost:8000/musee, I get the good amount of brackets compared to what is inside my database, but they appear empty.
I think I might be missing a step but I'm not sure where to search. Where do you think I should look?
UPDATE:
The version of Symfony that I have is 3.4.
I enabled serializer in my config.yml and installed with composer : jms/serializer-bundle.
In my app Kernel I have :
new FOS\RestBundle\FOSRestBundle(),
new JMS\SerializerBundle\JMSSerializerBundle(),
new Nelmio\CorsBundle\NelmioCorsBundle(),
The problem is common to all my entities. I get the right amount of brackets but no content inside.

Answer 1

FOSRestBundle's docs cover the serialization here: Enable a Serializer
But CSS seems to be falling apart presently, so I'll quote it:
C) Enable a Serializer
This bundle needs a serializer to work correctly. In most cases, you'll need to enable a serializer or install one. This bundle tries the following (in the given order) to determine the serializer to use:
The one you configured using fos_rest.services.serializer (if you did).
The JMS serializer, if the JMSSerializerBundle is available (and registered).
The Symfony Serializer if it's enabled (or any service called serializer).
Questions:
Which version of Symfony do you use?
Have you enabled Serializer component?
Is the issue limited to Musee or all entities?
Please update the question with these and we can follow up.
Update:
Can't help but wonder if it has anything to do with all services becoming private in Symfony 3.4. Maybe FOSRestBundle cannot find the JMSSerializerBundle. Which version of FOSRestBundle you have installed?
I see that all released versions of FOSRestBundle specify the ^3.0 dependency requirement, but the above is specific to v3.4.

Answer 2

That happens because you are returning an array of entities instead of valid json response. I am working in REST/API too, but without FOSRest, so I cant be completely sure how serialization happens with FOSREST, but definitively is that.
A workaround could be returning a JSONResponse in your controller, with all of your entities serialized somehow instead of returning the array of entities as you are currently doing here
return $musee;

Answer 3

I recreated my project and this time didn't get an error... I'm not sure of what was the reason but I used the same Symfony versions and commands. So there was probably a problem somewhere even if I try to compare both and din't see any difference. I'll try to tell you if I find it.