injection – Dakwamine

The code

services:
  my_module.event_subscriber:
    # Your service class
    class: Drupal\my_module\Entity\EventSubscriber\MyModuleSubscriber

    # Add your services to load here in the array
    arguments: ['@current_user']

    tags:
      # For this example, I am making an event subscriber class
      - { name: event_subscriber }

services:

my_module.event_subscriber:

# Your service class

class: Drupal\my_module\Entity\EventSubscriber\MyModuleSubscriber

# Add your services to load here in the array

arguments: ['@current_user']

tags:

# For this example, I am making an event subscriber class

- { name: event_subscriber }

<?php

namespace Drupal\my_module\Entity\EventSubscriber;

use Drupal\Core\Session\AccountProxy;
use Symfony\Component\EventDispatcher\Event;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;

class MyModuleSubscriber implements EventSubscriberInterface {

  /**
   * Current user service.
   * @var AccountProxy
   */
  protected $currentUser;

  public function __construct(AccountProxy $current_user) {
    // Reference the current_user service
    $this->currentUser = $current_user;
  }

  static function getSubscribedEvents() {
    // Stuff related to events subscribing in Drupal
    $events[KernelEvents::REQUEST][] = ['kernel_request'];
    return $events;
  }

  /**
   * @param GetResponseEvent $event
   */
  public function kernel_request(Event $event) {
    // Do stuff here, using $this->currentUser
  }

}

<?php

namespace Drupal\my_module\Entity\EventSubscriber;

use Drupal\Core\Session\AccountProxy;

use Symfony\Component\EventDispatcher\Event;

use Symfony\Component\EventDispatcher\EventSubscriberInterface;

use Symfony\Component\HttpKernel\Event\GetResponseEvent;

use Symfony\Component\HttpKernel\KernelEvents;

class MyModuleSubscriber implements EventSubscriberInterface {

/**

* Current user service.

* @var AccountProxy

protected $currentUser;

public function __construct(AccountProxy $current_user) {

// Reference the current_user service

$this->currentUser = $current_user;

}

static function getSubscribedEvents() {

// Stuff related to events subscribing in Drupal

$events[KernelEvents::REQUEST][] = ['kernel_request'];

return $events;

}

/**

* @param GetResponseEvent $event

public function kernel_request(Event $event) {

// Do stuff here, using $this->currentUser

}

Additional Information Declare the services your class will use in the .services.yml file of your module. Unlike plugin type class service dependency injection, there is no create method to define the needed services. The __construct signature needs to respect the declared arguments from the .services.yml file. Originally made and tested on […]

The code

<?php

namespace Drupal\my_module\Controller;

use Drupal\Core\Controller\ControllerBase;
use Drupal\Core\Entity\EntityTypeManager;    // Example service class to load and use
use Drupal\Core\Entity\Query\QueryFactory;   // Another example service class to load and use
use Symfony\Component\DependencyInjection\ContainerInterface;

class MyModuleController extends ControllerBase {

  /**
   * @var QueryFactory
   */
  protected $queryFactory;

  /**
   * @var EntityTypeManager
   */
  protected $entityTypeManager;

  public static function create(ContainerInterface $container) {
    // Get your services here.
    return new static(
        $container->get('entity.query'), $container->get('entity_type.manager')
    );
  }

  public function __construct(QueryFactory $query_factory, EntityTypeManager $entity_type_manager) {
    // Reference your services here for future use
    $this->queryFactory = $query_factory;
    $this->entityTypeManager = $entity_type_manager;
  }

  public function content() {
    // Do Controller stuff...
    $ids = $this->queryFactory->get('node')->condition('type', 'article')->pager(15)->execute();
    $entities = $this->entityTypeManager->getStorage('node')->loadMultiple($ids);

    // etc...
  }

}

<?php

namespace Drupal\my_module\Controller;

use Drupal\Core\Controller\ControllerBase;

use Drupal\Core\Entity\EntityTypeManager; // Example service class to load and use

use Drupal\Core\Entity\Query\QueryFactory; // Another example service class to load and use

use Symfony\Component\DependencyInjection\ContainerInterface;

class MyModuleController extends ControllerBase {

/**

* @var QueryFactory

protected $queryFactory;

/**

* @var EntityTypeManager

protected $entityTypeManager;

public static function create(ContainerInterface $container) {

// Get your services here.

return new static(

$container->get('entity.query'), $container->get('entity_type.manager')

);

}

public function __construct(QueryFactory $query_factory, EntityTypeManager $entity_type_manager) {

// Reference your services here for future use

$this->queryFactory = $query_factory;

$this->entityTypeManager = $entity_type_manager;

}

public function content() {

// Do Controller stuff...

$ids = $this->queryFactory->get('node')->condition('type', 'article')->pager(15)->execute();

$entities = $this->entityTypeManager->getStorage('node')->loadMultiple($ids);

// etc...

}

Additional Information Unlike service type class service dependency injection, there may be no need to implement an interface to be able to load the needed services, such as extending from ControllerBase. So if you are extending from a class which already has the dependency injection implementation, you can just override the create […]

Tag Archives: injection

[Drupal] Service dependency injection in a service type class

[Drupal] Service dependency injection in a plugin type class