Disable caching on a route

Question

I have a route with a parameter, e.g. /r/{app_id}. The controller extends ContainerInjectionInterface. The method either returns a render array or a new TrustedRedirectResponse.

I believe I have a caching problem because subsequent visits to the page will not update even with changing {app_id}. If I visit from another browser I get the correct response one time.

My controller is, basically, this:

if (!$a) {
  return ['#markup' => 'no'];
}

return new TrustedRedirectResponse($url);

I have tried to disable cache in several ways, to no avail:

• addCacheableDependency
• putting #cache => ['max-age' => 0] on the render array
• \Drupal::service('page_cache_kill_switch')->trigger();
• using $response = new Response() and $response->setCache(['max_age' => 0]) and then, from within the conditional, using $response->setContent('blah')

Not having luck with any of the above.

Answer 1

You have to do all together, set cache max-age = 0 for all responses the controller returns and apply the kill switch

public function mycontroller() {

  \Drupal::service('page_cache_kill_switch')->trigger();

  if (!$a) {
    return [
      '#markup' => 'no',
      '#cache' => ['max-age' => 0],
    ];
  }

  return (new TrustedRedirectResponse($url))
    ->addCacheableDependency((new CacheableMetadata())->setCacheMaxAge(0));
}

and then clear the cache one more time.

Answer 2

You can also disable caching via the route under the options key like this, no_cache: 'TRUE'. Here is a full example of a route:

my_awesome_module.do
  path: '/do-awesome'
  defaults:
    _controller: '\Drupal\my_awesome_module\Controller\MyAwesomeModuleController::doAwesome'
  options:
    no_cache: 'TRUE'