RedirectResponse not able to redirect in hook_entity_view drupal 8

Question

I am trying to redirect users to a page on entity view. I am using RedirectResponse in hook_entity_view. But it is not redirecting to the desired page.

This is how I implemented this. After fetching my redirect url, I have passed it to RedirectResponse.

return new RedirectResponse($redirect_url);

Thank you

Answer 1

Thank you, I got it working. Don't need to return the object of RedirectResponse. It works like this.

$response = new RedirectResponse($redirect_url);

$response->send();

It works this way.

Answer 2

After filling in the prompts with Drupal Console after executing drupal generate:event:subscriber, and entering kernel.request when prompted for the event name, it's possible to add something like the following to the callback function that handles the event:

use Symfony\Component\HttpFoundation\RedirectResponse;
...
 /**
   * This method is called whenever the kernel.request event is
   * dispatched.
   *
   * @param GetResponseEvent $event
   */
  public function kernelRequest(GetResponseEvent $event) {
    $request = $event->getRequest();
    $route_name = $request->attributes->get('_route');

    if ($route_name == 'entity.checkout.canonical') {

     // Create the destination URL, such as:
      $url = Url::fromRoute('user.register')->toString();

      // create redirect:
      $response = new RedirectResponse($url);
      $response->send();
    }
  }