symfony 4/5 controller/action Cheatsheet

Get Request Params

https://symfony.com/doc/5.4/controller.html#the-request-and-response-object

• $request->headers->all()
• GET: $request->query->all()
• POST: $request->request->all()
• e.g. JSON payload: $request->getContent() + json_decode()
• $request->server->all()

Get env/debug

• $this->getParameter('kernel.environment')  // prod, dev
  
  $this->getParameter('kernel.debug') // true, false

Error Handling / 404 / 500

https://symfony.com/doc/current/controller.html#managing-errors-and-404-pages
https://symfony.com/doc/5.4/controller/error_pages.html

• // In a controller action
  if (!$foo)) {
      throw $this->createNotFoundException('No foo going on!');
  }

Custom error page:

• Create "templates/bundles/TwigBundle/Exception/error.html.twig"

  • {% extends 'base.html.twig' %}
    
    {# Test with http://localhost:8040/_error/404 #}
    
    {% block body %}
        <h1>{{ status_code }} - Sorry, something went wrong...</h1>
        <p>
            <a href="/">Back to homepage</a>.
        </p>
    
        <script>
            setTimeout(() => {
                window.location.href = '/';
            }, 2000);
        </script>
    
    {% endblock %}

Redirect

• return $this->redirect($fixedUrl, 301);

Redirect directly from a controller subroutine:

• $redirectResponse = $this->redirect($fixedUrl, 301);
  $redirectResponse->send();

Generate URL

• $this->generateUrl('fooRouteName', [
      'foo' => 'bar',
  ], 1); // 1 = ABSOLUTE_PATH e.g. "/dir/file"

Generate URL outside controller, eg. in repository

• class FooRepository extends ServiceEntityRepository
  {
      private $router;
  
      public function __construct(RouterInterface $router)
      {
          $this->router = $router;
  
          parent::__construct($registry, Foo::class);
      }
  
      public function bar() {
          $this->router->generate(...); // Same method as "generateUrl()" in controller
      }

Use Doctrine / EntityManager

• // In a symfony controller inject the entity manager:
  public function test(EntityManagerInterface $em) {   
  
      $country = new Country();
      $country->setName('Foo');
  
      $em->persist($country);
      $em->flush();
  }