Helpful Drupal Classes and Methods

These are some of the Drupal core classes and their methods that help me in my day to day work.

Drupal Core Class Methods

Drupal::Url

Get current Url

$url = Url::fromRoute('<current>'); //Route Object, if no options were added we get a relative URL
$url = Url::fromRoute('<current>',['absolute'=> 'true']); //Route Object, 'Absolute' parameter was passed, we get a an absolute url
$url = $url->toString(); // String url

Pass Parameters to another Route

// On form submit, do this
 $url = Url::fromRoute('ROUTE')->setRouteParameters([
    'name' => $name,
]);

// redirect form to this url with these parameters
$form_state->setRedirectUrl($url);

Drupal::messenger

Drupal::messenger() helps us show messages on the page

Create a link as a message

   \Drupal::messenger()->addError('');
   \Drupal::messenger()->addWarning('');
   \Drupal::messenger()->addStatus(['#markup' => '<a href=' . $enlace_convocatoria_nueva . ' target="_blank" rel= noopener noreferrer" >OPEN LINK</a>']);

Drupal::routeMatch

The Drupal::routeMatch() method is used to get the current route and its parameters.

Get current Route

$current_route = \Drupal::routeMatch()->getRouteName();
$current_parameters = \Drupal::routeMatch()->getParameters();

Drupal::request

The Drupal::request() method is used to get the current request and its parameters.

Get current domain

\Drupal::request()->getSchemeAndHttpHost()

Get BaseUrl

\Drupal::request()->baseUrl()

Get a specific query parameters from current URL

$keyword = \Drupal::request()->query->get('QUERY_PARAMETER');

Services

The Drupal::service() method is used to get a service from the container. Services are objects that are used to perform a specific task. For example, the path.alias_manager service is used to get the alias of a path. The container is a registry of all the services that are available in Drupal. You can get a list of all the services by going to http://localhost/my_site_name_dir/web/core/modules/system/src/ServiceProviders/ServiceProvider.php.

path.current - get current path

$current_path = \Drupal::service('path.current')->getPath();

path_alias.manager - get current path alias

$path_alias = \Drupal::service('path_alias.manager')->getAliasByPath($current_path);

path.matcher

The path.matcher service is used to check if the current path is the frontpage.

 \Drupal::service('path.matcher')->isFrontPage();