Drupal webform event8/7/2023 ![]() Think of that process as being akin to calling a friend every evening to find out what’s happened over the past 24 hours. In Drupal, we most commonly rely on a cron task to make periodic requests, tailoring the frequency of those calls to the timeliness of the data that’s being retrieved, the ebb and flow of traffic to the site, or both. If you’ve worked with APIs in the past, you’re probably familiar with the general process: make a request to a third-party service to ask for some data and it responds to let you know what-if anything-is new. Clone that repository to your Custom modules folder and enable it to follow along with our example. You’ll want to begin by downloading the sample Drupal module we’ve assembled from the Bounteous GitHub account. Once ready, the route is added to Drupal using the add() method and given a name of mymodule.a_custom_path.Note: To try out our example code, you can skip over the lengthier explanations and simply follow the instructions in the blue boxes. The following code creates a Route object with the path "/a_custom_path" and then defines some attributes for that route. The Route object takes a number of parameters that can either be added to the controller or afterwards using methods of the object. In order to create a route we need to generate a Route object and then add it to the RouteCollection using the add() method. I've mentioned that it's possible to create a route in a route subscriber, so let's look at that in action. public static function getSubscribedEvents() ') Īs a side note, this isn't how the Path Auto module works, which creates an additional path to the entity, instead of changing the entity route. This is counter intuitive as higher values make the route subscriber trigger earlier in the alter process. ![]() The following changes the event weight to -1025 so that it will be called after any other route subscribers have altered the routes. It is possible to change the weight of the route event callback by overriding the getSubscribedEvents() method in your route subscriber class. The RouteSubscriberBase class registers a method called onAlterRoutes() as an event callback, in which the event object is translated into the RouteCollection and passed onto the alterRoutes() method. This isn't the case with route subscribers as the Drupal\Core\Routing\RouteSubscriberBase class implements the getSubscribedEvents() method like an event subscriber would. Also the event method callback receives an event object as a parameter. When setting up an event service we normally have to create a getSubscribedEvents() method to register what event we are listening for. Here is a skeleton route subscriber class that can be used in an project. This collection of routes is referenced by the route name and can be used to alter, add, or delete any routes from the system. This RouteCollection object is every route that has been discovered by Drupal, essentially as a big list of Route objects. The route subscriber itself it pretty simple as you just extend the Drupal\Core\Routing\RouteSubscriberBase class and define a method called alterRoutes(), which accepts a RouteCollection object. Your module's directory structure should look something like this with the route subscriber in place. This can be put anywhere in the module, but its conventionally put into a Routing directory within the module src directory. ![]() ![]() Next, we need to add the routing class to listen to the event. services:Ĭlass: Drupal\mymodule\Routing\CustomRouteSubscriber Adding a tag with the name of "event_subscriber" tells Drupal that this class should be included when events are triggered. Registering a route subscriber is done just like any other even subscriber with an entry in the module services YAML file. In this article I will go through how to set up a route alter event subscriber, why the setup is slightly different from normal events, and what this event might be used for. This is because Drupal takes care of the trigger setup and allows you to create an event subscriber that will automatically trigger when the routes are created. Creating services that listen events in Drupal is pretty straightforward you just need to create and register a service class and let Drupal know what event you want to trigger on.Īltering routes in a Drupal site is also done through an event trigger, but in this case the implementation is slightly different.
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