json_encode() recursion detected Symfony2 JMSSerializerBundle - symfony

Question

I'm currently trying to expose groups for an ajax call.
If I user #Expose on each field it works like a charm but if I replace it with #Groups it throws the error recursion detected in JsonSerializationVisitor.php on line 29 and the results in my ajax return has a 'null' value.
Warning: json_encode() [function.json-encode]: recursion detected in /Applications/MAMP/htdocs/xxx-ref/vendor/jms/serializer/src/JMS/Serializer/JsonSerializationVisitor.php on line 29
{"datas":[{"datas":null,"errors":[],"redirect":null},{},{},{},{},{},{},{},{},{},{},{}],"errors":[],"redirect":null}
This is my call to the serializer =>
$context = new SerializationContext(false, 1);
$context->setSerializeNull(true);
$context->setGroups(array('details'));
$response->setContent($this->get('serializer')->serialize(array( 'datas'=>$datas, 'errors'=>$errors, 'redirect'=>$redirect), 'json', $context));
And this is the entity used
<?php
namespace XXX\CoreBundle\Entity\Geo;
use Doctrine\ORM\Mapping as ORM;
use Gedmo\Mapping\Annotation as Gedmo;
use JMS\Serializer\Annotation\ExclusionPolicy;
use JMS\Serializer\Annotation\Exclude;
use JMS\Serializer\Annotation\Expose;
use JMS\Serializer\Annotation\Groups;
use XXX\CommonBundle\Entity\interfaces\TranslatableInterface;
use XXX\CoreBundle\Entity\Geo\Translation\AddressTranslation;
use XXX\CoreBundle\Proxy\AddressTranslatorProxy;
/**
* #ORM\Entity(repositoryClass="XXX\CoreBundle\Repository\Geo\AddressRepository")
* #ORM\HasLifecycleCallbacks()
* #ORM\Table(name="geo_address",
* indexes={#ORM\Index(name="address_idx", columns={"geolocation","formattedAddress","slug","valid"})})
* #Gedmo\TranslationEntity(class="XXX\CoreBundle\Entity\Geo\Translation\AddressTranslation")
* #ExclusionPolicy("all")
*/
class Address {
/**
* #ORM\Id
* #ORM\Column(type="bigint")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #ORM\ManyToOne(targetEntity="XXX\CoreBundle\Entity\Geo\Country", inversedBy="addresses", fetch="EXTRA_LAZY")
* #ORM\JoinColumn(name="country_id", referencedColumnName="id")
*
*/
protected $country;
/**
* #ORM\Column(type="string", length=128, unique=true)
* #Gedmo\Slug(fields={"formattedAddress"})
*
*/
protected $slug;
/**
* #ORM\Column(type="string", length=255, nullable=false)
* #Gedmo\Translatable(fallback=true)
*
*/
protected $formattedAddress;
/**
* #ORM\Column(type="point", unique=true)
*
*/
protected $geolocation;
/**
* #ORM\ManyToOne(targetEntity="XXX\CoreBundle\Entity\Geo\Street", inversedBy="addresses")
* #ORM\JoinColumn(name="street_id", referencedColumnName="id")
*
*/
protected $street;
/**
* #ORM\Column(type="string", length=32, nullable=true)
* #Groups({"details"})
*/
protected $number;
/**
* #ORM\Column(type="string", length=32, nullable=true)
*
*/
protected $postbox;
/**
* #ORM\Column(type="string", length=16, nullable=true)
*
*/
protected $postalCode;
/**
* #ORM\ManyToOne(targetEntity="XXX\CoreBundle\Entity\Geo\Locality", inversedBy="addresses")
* #ORM\JoinColumn(name="locality_id", referencedColumnName="id", nullable=true)
*
*/
protected $locality;
/**
* #ORM\ManyToOne(targetEntity="XXX\CoreBundle\Entity\Geo\Sublocality", inversedBy="addresses")
* #ORM\JoinColumn(name="sublocality_id", referencedColumnName="id", nullable=true)
*
*/
protected $sublocality;
/**
* #ORM\ManyToOne(targetEntity="XXX\CoreBundle\Entity\Geo\AdministrativeAreaLevel1", inversedBy="addresses")
* #ORM\JoinColumn(name="al1_id", referencedColumnName="id")
*
*/
protected $administrativeAreaLevel1;
/**
* #ORM\ManyToOne(targetEntity="XXX\CoreBundle\Entity\Geo\AdministrativeAreaLevel2", inversedBy="addresses")
* #ORM\JoinColumn(name="al2_id", referencedColumnName="id")
*
*/
protected $administrativeAreaLevel2;
/**
* #ORM\ManyToOne(targetEntity="XXX\CoreBundle\Entity\Geo\AdministrativeAreaLevel3", inversedBy="addresses")
* #ORM\JoinColumn(name="al3_id", referencedColumnName="id")
*
*/
protected $administrativeAreaLevel3;
/**
* #ORM\Column(type="string", length=255)
*
*/
protected $geolocationType;
/**
* #ORM\Column(type="point")
*
*/
protected $viewportSouthWest;
/**
* #ORM\Column(type="point")
*
*/
protected $viewportNorthEast;
/**
* #ORM\Column(type="boolean", nullable=false)
*
*
*/
protected $valid;
/**
* #ORM\OneToMany(targetEntity="XXX\CoreBundle\Entity\Geo\ChangeRequest", mappedBy="address")
*/
protected $changeRequest;
/**
* #ORM\OneToMany(targetEntity="XXX\CoreBundle\Entity\Ads\Hybrid", mappedBy="address")
*/
protected $hybrids;
/**
* #ORM\OneToMany(
* targetEntity="XXX\CoreBundle\Entity\Geo\Translation\AddressTranslation",
* mappedBy="object",
* cascade={"persist","remove"}, fetch="EXTRA_LAZY"
* )
* #ORM\JoinColumn(name="translatable_id", referencedColumnName="id", nullable=true)
*/
protected $translations;
function __construct() {
$this->hybrids = new \Doctrine\Common\Collections\ArrayCollection();
$this->changeRequest = new \Doctrine\Common\Collections\ArrayCollection();
$this->translations = new \Doctrine\Common\Collections\ArrayCollection();
$this->valid = false;
}
public function getLocalityAsText() {
if ($this->postalCode != null) {
return strtolower( $this->country->getIso3166Alpha2()."-".$this->postalCode );
} else {
return strtolower( $this->country->getIso3166Alpha2()."-".$this->locality->getName() );
}
}
public function __toString() {
return $this->getFormattedAddress();
}
public function translate($locale = null)
{
return new AddressTranslatorProxy(
$this,
$locale,
array('formattedAddress'),
'XXX\CoreBundle\Entity\Geo\Translation\AddressTranslation',
$this->translations
);
}
public function isPrecise() {
return ( $this->getGeolocationType() === 'ROOFTOP' || $this ->getGeolocationType() === 'RANGE_INTERPOLATED' );
}
public function getTranslations()
{
return $this->translations;
}
public function addTranslation(AddressTranslation $t)
{
if (!$this->translations->contains($t)) {
$this->translations[] = $t;
$t->setObject($this);
}
}
public function removeTranslation(AddressTranslation $t)
{
if ($this->translations->contains($t)) {
$this->translations->remove($t);
}
}
public function getHybrids() {
return $this->hybrids;
}
public function setHybrids($hybrids) {
$this->hybrids = $hybrids;
return $this;
}
public function getFormattedAddress($locale=null) {
return $this->formattedAddress;
}
public function getId() {
return $this->id;
}
public function getGeolocation() {
return $this->geolocation;
}
public function setGeolocation($geolocation) {
$this->geolocation = $geolocation;
return $this;
}
public function getStreet() {
return $this->street;
}
public function setStreet($street) {
$this->street = $street;
return $this;
}
public function getNumber() {
return $this->number;
}
public function setNumber($number) {
$this->number = $number;
return $this;
}
public function getPostbox() {
return $this->postbox;
}
public function setPostbox($postbox) {
$this->postbox = $postbox;
return $this;
}
public function getLocality() {
return $this->locality;
}
public function setLocality($locality) {
$this->locality = $locality;
return $this;
}
public function getSublocality() {
return $this->sublocality;
}
public function setSublocality($sublocality) {
$this->sublocality = $sublocality;
return $this;
}
public function getCountry() {
return $this->country;
}
public function setCountry($country) {
$this->country = $country;
return $this;
}
public function getAdministrativeAreaLevel1() {
return $this->administrativeAreaLevel1;
}
public function setAdministrativeAreaLevel1($administrativeAreaLevel1) {
$this->administrativeAreaLevel1 = $administrativeAreaLevel1;
return $this;
}
public function getAdministrativeAreaLevel2() {
return $this->administrativeAreaLevel2;
}
public function setAdministrativeAreaLevel2($administrativeAreaLevel2) {
$this->administrativeAreaLevel2 = $administrativeAreaLevel2;
return $this;
}
public function getAdministrativeAreaLevel3() {
return $this->administrativeAreaLevel3;
}
public function setAdministrativeAreaLevel3($administrativeAreaLevel3) {
$this->administrativeAreaLevel3 = $administrativeAreaLevel3;
return $this;
}
public function getGeolocationType() {
return $this->geolocationType;
}
public function setGeolocationType($geolocationType) {
$this->geolocationType = $geolocationType;
return $this;
}
public function getViewportSouthWest() {
return $this->viewportSouthWest;
}
public function setViewportSouthWest($viewportSouthWest) {
$this->viewportSouthWest = $viewportSouthWest;
return $this;
}
public function getViewportNorthEast() {
return $this->viewportNorthEast;
}
public function setViewportNorthEast($viewportNorthEast) {
$this->viewportNorthEast = $viewportNorthEast;
return $this;
}
public function getChangeRequest() {
return $this->changeRequest;
}
public function setChangeRequest($changeRequest) {
$this->changeRequest = $changeRequest;
return $this;
}
public function setFormattedAddress($formattedAddress) {
$this->formattedAddress = $formattedAddress;
return $this;
}
public function getPostalCode() {
return $this->postalCode;
}
public function setPostalCode($postalCode) {
$this->postalCode = $postalCode;
return $this;
}
public function getValid() {
return $this->valid;
}
public function setValid($valid) {
$this->valid = $valid;
return $this;
}
public function getSlug() {
return $this->slug;
}
public function setSlug($slug) {
$this->slug = $slug;
return $this;
}
}

Answer 1

I answered my own question
I just needed to add
#Expose
before the Groups annotation.
/**
* #ORM\Column(type="string", length=32, nullable=true)
* #Expose
* #Groups({"details"})
*/
protected $number;