D8 - Services with Dependency Injection Example

D8 - Services with Dependency Injection

D8 - Services with Dependency Injection

...

lightning-8/modules/custom/basic/basic.services.yml

services:
  basic.basic_hero_articles:
    class: Drupal\basic\BasicArticleService

  basic.basic_recipes:
    class: Drupal\basic\BasicRecipeService
    arguments: ['@entity.query', '@entity.manager']

...

lightning-8/modules/custom/basic/src/BasicRecipeService.php

<?php

namespace Drupal\basic;

use Drupal\Core\Entity\Query\QueryFactory;
use Drupal\Core\Entity\EntityManager;

/**
 * Our basic recipes service
 */
class BasicRecipeService {

  private $entityQuery;
  private $entityManager;

  public function __construct(QueryFactory $entityQuery, EntityManager $entityManager) {
    $this->entityQuery = $entityQuery;
    $this->entityManager = $entityManager;
  }

  /**
   * Methood for getting the recipes
   */
  public function getRecipes() {
    $recipesNids = $this->entityQuery->get('node')->condition('type', 'recipe')->execute();
    return $this->entityManager->getStorage('node')->loadMultiple($recipesNids);
  }
}

...

Test using devel/php page

$basicRecipeService = Drupal::service("basic.basic_recipes");
kint($basicRecipeService->getRecipes()); die();

For entity query, we can use getQuery from entityTypeManager.

$query = $this->entityTypeManager->getStorage('node')->getQuery(); 

https://www.drupal.org/node/2849874