Symfony2：在页面之间传递参数的问题

I am quite new about using Symfony 2 for developing in PHP, so i used the "Symfony Blog" example as the base of a new simple app in order to try out what i learnt.

I have got this rule defined:

AhorrarMainBundle_cuenta:
  pattern:  /cuenta/{id}
  defaults: { _controller: AhorrarMainBundle:Cuenta:cuenta }
  requirements:
       _method:  GET
            id: \d+

So i expect that when i write this address in my browser (ahorro/app_dev/cuenta/1) it launchs "cuentaAction" passing a number 1 as an argument.

This is the code of the twig template i am using as layout:

{% block navigation %}
   <nav>
      <ul class="navigation">
         <li><a href="#">Home</a></li>
         <li><a href="#">About</a></li>
         <li><a href="{{ path('AhorrarMainBundle_cuenta', {'id': id}) }}">Cuenta</a></li>
         <li><a href="{{ path('AhorrarMainBundle_movimientos') }}">Movimientos</a></li>
      </ul>
   </nav>
{% endblock %}

This is the code of the page launched when calling "ahorro/app_dev/cuenta/1":

{% extends "AhorrarMainBundle::base.html.twig" %}
{% block title %}Cuenta{% endblock%}
{% block body %}
    <header>
        <h1>Cuenta symAhorro</h1>
    </header>
{% endblock %}

Indeed, it is just a simple page i expected to be showed and nothing more. But when i try to access to any page i get this error:

![Error image] http://imageshack.com/a/img837/1190/dg53.jpg

EDITED This is the class i am using as controller:

class CuentaController extends Controller{
public function indexAction()
{
    return $this->render('AhorrarMainBundle:MainPage:index.html.twig');
}
public function cuentaAction($id)
{
    $em = $this->getDoctrine()->getManager();

    $cuenta = $em->getRepository('AhorrarMainBundle:Cuenta')->find($id);

    if (!$cuenta) {
        throw $this->createNotFoundException('Unable to find Blog post.');
    }

    return $this->render('AhorrarMainBundle:Cuenta:cuenta.html.twig', array(
        'cuenta'      => $cuenta,
    ));
}
}

So seems the problem is that the "id" variable doesnt exist, but i think i followed what the "Symfony book" says about arguments...

Can anyone help me saying how should i do this? or maybe where can i find a working example?

Thanks in advance.

If you didn't specifically assign the template variable in the controller, it does not automatically exist.

You can get the request parameter named 'id' via the default request variable:

app.request.get( 'id' )

or if you want to use it in several places, assign the variable yourself:

{% set id = app.request.get( 'id' ) %}

What hpoeri commented is one solution to your problem.

Another one (and, usually preferred) would be to return your $id variable from the controller to the view, since this is basically what the separation between controller and view is about. So your return statement within your controller should read:

return $this->render('AhorrarMainBundle:Cuenta:cuenta.html.twig', array(
    'cuenta'      => $cuenta,
    'id'          => $id
));

All variables you pass in the returned array get available in your view.

Have a look at the Symfony2 documentation here, especially the section called "Rendering Tamplates" http://symfony.com/doc/current/book/controller.html#rendering-templates and the section about "Views" which explains variable handling a little bit better here: http://symfony.com/doc/current/quick_tour/the_view.html