How to set form action in Symfony2? (2.8 LTS) - symfony

Question

So I've been playing around with Symfony forms and I want to change the form action.
I've followed this guide but I don't understand what it means by "target_route". As such, I was getting an error message (see below)
I have the code below and I'm pretty sure the route I used in setAction is valid since I can browse it using my browser.
Any ideas? Thank you
my code:
<?php
// src/AppBundle/Controller/DirectoryController.php
namespace AppBundle\Controller;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Response;
class DirectoryController extends Controller {
/**
* #Route("/directory/form")
*/
public function formAction() {
$form = $this->get("form.factory")
->createNamedBuilder("form", "form")
->setAction($this->generateUrl("/directory/search"))
->setMethod("get")
->add("search", "submit", array("label" => "Search"))
->add("reset", "reset", array("label" => "Reset"))
->getForm();
return $this->render(
"directory/form.html.twig",
array("form" => $form->createView()
,
)
);
}
/**
* #Route("/directory/search")
*/
public function searchAction() {
return $this->render(
"directory/view.html.twig"
);
}
}
error message:
Unable to generate a URL for the named route "/directory/search" as such route does not exist.

Answer 1

In the example, target_route is the name of a route, not its url. For example, you might define an action like this:
/**
* #Route("/directory/search", name="directory_search")
*/
public function searchAction() {
In that case, your route would have a name of directory_search. You would then use $this->generateUrl('directory_search') to have the router turn the name into a url.
The reason you do it this way (as opposed to using urls directly) is that this allows you to change a url without having to change every place in your code that references it.
->setAction($this->generateUrl("/directory/search"))
setAction() expects a url. So you while you can give it '/directory/search', best practice would be to it $this->generateUrl('directory_search').