Symfony Serialize doctrine entity
<p>I have a simple entity class:</p>

<pre><code>&lt;?php
namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections\ArrayCollection;


/**
 * @ORM\Entity(repositoryClass="CompanyUserRepository")
 * @ORM\Table(name="company_users")
 */
class CompanyUser
{
/**
 * @ORM\Column(type="integer")
 * @ORM\Id
 * @ORM\GeneratedValue(strategy="AUTO")
 */
private $id;

/**
 * @ORM\Column(type="string", length=100)
 */
private $firstName;

/**
 * @ORM\Column(type="string", length=100)
 */
private $lastName ;

/**
 * @ORM\OneToMany(targetEntity="Score", mappedBy="user")
 */
private $scores;
/**
 * Constructor
 */
public function __construct()
{
    $this-&gt;scores = new ArrayCollection();
}

/**
 * Get id
 *
 * @return integer
 */
public function getId()
{
    return $this-&gt;id;
}

/**
 * Set firstName
 *
 * @param string $firstName
 *
 * @return CompanyUser
 */
public function setFirstName($firstName)
{
    $this-&gt;firstName = $firstName;

    return $this;
}

/**
 * Get firstName
 *
 * @return string
 */
public function getFirstName()
{
    return $this-&gt;firstName;
}

/**
 * Set lastName
 *
 * @param string $lastName
 *
 * @return CompanyUser
 */
public function setLastName($lastName)
{
    $this-&gt;lastName = $lastName;

    return $this;
}

/**
 * Get lastName
 *
 * @return string
 */
public function getLastName()
{
    return $this-&gt;lastName;
}

/**
 * Add score
 *
 * @param \AppBundle\Entity\Score $score
 *
 * @return CompanyUser
 */
public function addScore(\AppBundle\Entity\Score $score)
{
    $this-&gt;scores[] = $score;

    return $this;
}

/**
 * Remove score
 *
 * @param \AppBundle\Entity\Score $score
 */
public function removeScore(\AppBundle\Entity\Score $score)
{
    $this-&gt;scores-&gt;removeElement($score);
}

/**
 * Get scores
 *
 * @return \Doctrine\Common\Collections\Collection
 */
public function getScores()
{
    return $this-&gt;scores;
}
</code></pre>

<p>}</p>

<p>The problem comes when I try to get all users and serialize them in json:</p>

<pre><code>/**
 * @Route("/api/getUsers", name="getUsers")
 */
public function getUsers(Request $request){
    $users = $this-&gt;getDoctrine()
    -&gt;getRepository('AppBundle:CompanyUser')
    -&gt;findAll();

    $serializer = $this-&gt;get('serializer');
    $data = $serializer-&gt;serialize($users, 'json');

    return new Response($users);
}
</code></pre>

<p>I get <em>A circular reference has been detected (configured limit: 1).</em>
When I remove the getScores getter everything works fine. I need to get only the id, firstName and lastName. Is there a way to not serialize the other objects?</p>