Why function relates to code that is not in function? - symfony

Question

I have the following controller:
<?php
namespace Dev\TaskBundle\Controller;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\Request;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Method;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Template;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Session\Session;
use Dev\TaskBundle\Entity\User;
class UserController extends Controller
{
/**
* Redirects to directory where you can input new password
*
* #Route("/{id}", name="user_update")
*/
public function userUpdatePanel($id)
{
$user = $this->getDoctrine()->getRepository('DevTaskBundle:User')->find($id);
return $this->render('DevTaskBundle:User:userUpdate.html.twig', array('user' => $user));
}
/**
* Updates password of the user
*
* #Route("/updatePassword", name="updatePass_action")
*/
public function passUpdateAction(Request $request)
{
$em = $this->getDoctrine()->getManager();
$id = $request->get('id');
$user = new User();
$user = $em->getRepository('DevTaskBundle:User')->find($id);
$password = $request->get('passInput');
$user->setPassword($password);
$em->flush();
$users = $this->getDoctrine()->getRepository('DevTaskBundle:User')->findAll();
return $this->render('DevTaskBundle:User:accounts.html.twig', array('users' => $users));
}
}
Here is form from userUpdate.html.twig
<form action="{{ path('updatePass_action') }}" method="POST">
<div>
Username: {{ user.username }}
</div>
<input type="hidden" name="id" value="{{user.id}}">
<div class="form-group">
<label for="passInput">Password:</label>
<input type="text" class="form-control" id="passInput" name="passInput" value="{{ user.password }}">
</div>
<button type="submit" class="btn btn-default">Change</button>
</form>
and when I proceed to change the password I receive such error
Impossible to access an attribute ("username") on a null variable in DevTaskBundle:User:userUpdate.html.twig at line 23
After changing the password I want to render accounts.html.twig so why there is the error about userUpdate? What is wrong here?
Part of accounts.html.twig with twig scripts:
<table class="table table-bordered">
<thead>
<tr>
<th>Login</th>
<th>Hasło</th>
<th>Narzędzia</th>
</tr>
</thead>
<tbody>
{% for user in users %}
<tr>
<td>
{{ user.username }}
</td>
<td>
{{ user.password }}
</td>
<td>
<a href="{{ path('user_update', {'id': user.id}) }}" >
<span class="glyphicon glyphicon-pencil linkDeco" ></span>
</a>
{% if user.status == 1 %}
<a href="{{ path('deleteAction', {'name': 'User' ,'direction': 'account_panel' , 'id': user.id}) }}" >
<span class="glyphicon glyphicon-trash linkDeco"></span>
</a>
{% endif %}
</td>
</tr>
{% endfor %}
</tbody>
</table>
EDIT
problem must be related to userUpdate.html.twig because when I deleted
<div>
Username: {{ user.username }}
</div>
I have the error
Impossible to access an attribute ("id") on a null variable in DevTaskBundle:User:userUpdate.html.twig at line 24
Any idea why is that?

Answer 1

Doctrine find method return array of objects, use findOne instead of find when you expecting only one result.
$user = $this->getDoctrine()->getRepository('DevTaskBundle:User')->findOneById($id);