symfony2 form is not displaying - symfony

Question

I am learning symfony2 and i have created one form in controller which is as bellow.
the controller file as DefaultController.php
namespace Banner\TestBundle\Controller;
use Banner\TestBundle\Entity\Contact;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Banner\TestBundle\Entity\Task;
use Symfony\Components\HttpFoundation\Request;
class DefaultController extends Controller
{
public function newAction(Request $request)
{
echo "The controller is called ";
$task = new Task();
$task->setTask("Write a blog Post ");
$task->setDueDate(new DateTime('tomorrow'));
$form = $this->createFormBuilder($task)
->add('task','text ')
->add('duedate','date')
->getForm();
return $this->render('BannerTestBundle:default:zoo.html.twig',array('form'=>$form->createView()));
}
}
my routing file is as below.
routing.yml
task_new:
pattern: /task/{request}
defaults: { _controller: BannerTestBundle:Default:new}
and the zoo.html.twig file is as bellow.
{% extends '::page.html.twig' %}
{% block title %}The Zoo{% endblock %}
{% block content %}
<form action="{{ path('task_new') }}" method="post" {{ form_enctype(form) }}>
{{ form_widget(form) }}
<input type="submit">
</form>
{% endblock %}
as i am passing the "task/GET" in my url it will shows the 'Request does not exist. error 500'.
what i basically want to do is when i pass the url the zoo.html.twig will be called. i want to display the form in zoo.html.twig.

Answer 1

You don't need to pass $request to your action and you don't need to put it in your route. The request object is available in global context. So
task_new:
pattern: /task-new
defaults: { _controller: BannerTestBundle:Default:new}
You can either leave it this way
public function newAction(Request $request)
or have
public function newAction()
and access request object like this
$request = $this->getRequest();

Answer 2

Your routing file is not properly indented so the yaml will not parse properly. Try:
task_new:
pattern: /task/{request}
defaults: { _controller: BannerTestBundle:Default:new}
Also:
It is probably a bad idea to override request that way
You don't appear to be doing anything with request in your controller