Symfony2 Logout code placement, where do I put the invalidate code - php

Question

New Symfony user here...
The examples in the Symfony Documentation don't actually have any examples of how to do a proper logout. Here is my security.yml
security:
encoders:
Symfony\Component\Security\Core\User\User: plaintext
AppBundle\Entity\User: bcrypt
role_hierarchy:
ROLE_ADMIN: [ROLE_USER]
providers:
chain_provider:
chain:
providers: [in_memory, user_db]
in_memory:
memory:
users:
admin: { password: adminpass, roles: ROLE_ADMIN }
user_db:
entity: { class: AppBundle:User, property: username }
firewalls:
main:
pattern: /.*
form_login:
login_path: /login
check_path: /login_check
default_target_path: /
logout:
path: /logout
target: /
invalidate_session: true
delete_cookies:
name:
path: null
domain: null
security: true
anonymous: true
access_control:
- { path: /login, roles: IS_AUTHENTICATED_ANONYMOUSLY }
- { path: /cms/user, roles: ROLE_ADMIN }
- { path: /.*, roles: IS_AUTHENTICATED_ANONYMOUSLY }
I was under the impression with those settings that simply hitting the /logout route the session would be destroyed and the user would be redirected to the login page. However in trying to do this, I get a no route found error.
I found this code here on stack-overflow...
$this->get('security.token_storage')->setToken(null);
$this->get('request')->getSession()->invalidate();
Great, but I'm so new in Symfony that I don't know where to put it. All of the examples here on Stack give that code, but don't say how to implement it. Do I write a logout action like this?
/**
* #Route("/logout")
*/
public function logoutAction() {
$this->get('security.token_storage')->setToken(null);
$this->get('request')->getSession()->invalidate();
//if this works how do I redirect to another route,
//specifically back to /login
return $this->render(
//do i need a template?
//do i need the array here?
);
}

Answer 1

No needed to write logout action in controller. All you have to do, is add the route with logout path.
In app/config/routing.yml:
user_logout:
path: /logout