Drupal Expert

<?php

namespace Drupal\mymodule;

use Drupal\Core\Entity\EntityTypeManagerInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

class DecoratedEntityTypeManager implements EntityTypeManagerInterface {
  
  public function __construct(
    protected EntityTypeManagerInterface $entityTypeManager
  ) {}
  
  // Implement all interface methods, delegating to wrapped service
  // Add custom logic where needed
}

services:
  mymodule.entity_type_manager.inner:
    decorates: entity_type.manager
    decoration_inner_name: mymodule.entity_type_manager.inner
    class: Drupal\mymodule\DecoratedEntityTypeManager
    arguments: ['@mymodule.entity_type_manager.inner']

<?php

namespace Drupal\mymodule\EventSubscriber;

use Drupal\Core\Routing\RouteMatchInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\RequestEvent;
use Symfony\Component\HttpKernel\KernelEvents;

class MyModuleSubscriber implements EventSubscriberInterface {
  
  public function __construct(
    protected RouteMatchInterface $routeMatch
  ) {}
  
  public static function getSubscribedEvents(): array {
    return [
      KernelEvents::REQUEST => ['onRequest', 100],
    ];
  }
  
  public function onRequest(RequestEvent $event): void {
    // Custom logic on every request
  }
}

<?php

namespace Drupal\mymodule\Annotation;

use Drupal\Component\Annotation\Plugin;

/**
 * Defines a Custom processor plugin annotation.
 *
 * @Annotation
 */
class CustomProcessor extends Plugin {
  
  public string $id;
  public string $label;
  public string $description = '';
}

<?php

use Drupal\Core\TypedData\DataDefinition;
use Drupal\Core\TypedData\ListDataDefinition;
use Drupal\Core\TypedData\MapDataDefinition;

$definition = MapDataDefinition::create()
  ->setPropertyDefinition('name', DataDefinition::create('string'))
  ->setPropertyDefinition('age', DataDefinition::create('integer'))
  ->setPropertyDefinition('emails', ListDataDefinition::create('email'));

$typed_data = \Drupal::typedDataManager()->create($definition, $values);

<?php

namespace Drupal\mymodule\Plugin\QueueWorker;

use Drupal\Core\Queue\QueueWorkerBase;

/**
 * @QueueWorker(
 *   id = "mymodule_processor",
 *   title = @Translation("My Module Processor"),
 *   cron = {"time" = 60}
 * )
 */
class MyModuleProcessor extends QueueWorkerBase {
  
  public function processItem($data): void {
    // Process queue item
  }
}

<?php

// Store temporary data that doesn't need export
\Drupal::state()->set('mymodule.last_sync', time());
$last_sync = \Drupal::state()->get('mymodule.last_sync', 0);

<?php

namespace Drupal\mymodule\Entity;

use Drupal\Core\Entity\ContentEntityBase;
use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\Core\Field\BaseFieldDefinition;

/**
 * Defines the Product entity.
 *
 * @ContentEntityType(
 *   id = "product",
 *   label = @Translation("Product"),
 *   base_table = "product",
 *   entity_keys = {
 *     "id" = "id",
 *     "label" = "name",
 *     "uuid" = "uuid",
 *   },
 *   handlers = {
 *     "view_builder" = "Drupal\Core\Entity\EntityViewBuilder",
 *     "list_builder" = "Drupal\mymodule\ProductListBuilder",
 *     "form" = {
 *       "default" = "Drupal\mymodule\Form\ProductForm",
 *       "delete" = "Drupal\Core\Entity\ContentEntityDeleteForm",
 *     },
 *     "access" = "Drupal\mymodule\ProductAccessControlHandler",
 *   },
 *   links = {
 *     "canonical" = "/product/{product}",
 *     "edit-form" = "/product/{product}/edit",
 *     "delete-form" = "/product/{product}/delete",
 *   },
 * )
 */
class Product extends ContentEntityBase {
  
  public static function baseFieldDefinitions(EntityTypeInterface $entity_type): array {
    $fields = parent::baseFieldDefinitions($entity_type);
    
    $fields['name'] = BaseFieldDefinition::create('string')
      ->setLabel(t('Name'))
      ->setRequired(TRUE)
      ->setDisplayOptions('form', [
        'type' => 'string_textfield',
        'weight' => 0,
      ])
      ->setDisplayConfigurable('form', TRUE)
      ->setDisplayConfigurable('view', TRUE);
    
    $fields['price'] = BaseFieldDefinition::create('decimal')
      ->setLabel(t('Price'))
      ->setSetting('precision', 10)
      ->setSetting('scale', 2)
      ->setDisplayOptions('form', [
        'type' => 'number',
        'weight' => 1,
      ])
      ->setDisplayConfigurable('form', TRUE)
      ->setDisplayConfigurable('view', TRUE);
    
    $fields['created'] = BaseFieldDefinition::create('created')
      ->setLabel(t('Created'))
      ->setDescription(t('The time that the entity was created.'));
    
    $fields['changed'] = BaseFieldDefinition::create('changed')
      ->setLabel(t('Changed'))
      ->setDescription(t('The time that the entity was last edited.'));
    
    return $fields;
  }
}

<?php

namespace Drupal\mymodule\Plugin\Block;

use Drupal\Core\Block\BlockBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides a 'Recent Products' block.
 *
 * @Block(
 *   id = "recent_products_block",
 *   admin_label = @Translation("Recent Products"),
 *   category = @Translation("Custom")
 * )
 */
class RecentProductsBlock extends BlockBase implements ContainerFactoryPluginInterface {
  
  public function __construct(
    array $configuration,
    $plugin_id,
    $plugin_definition,
    protected EntityTypeManagerInterface $entityTypeManager
  ) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
  }
  
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition): self {
    return new self(
      $configuration,
      $plugin_id,
      $plugin_definition,
      $container->get('entity_type.manager')
    );
  }
  
  public function defaultConfiguration(): array {
    return [
      'count' => 5,
    ] + parent::defaultConfiguration();
  }
  
  public function blockForm($form, FormStateInterface $form_state): array {
    $form['count'] = [
      '#type' => 'number',
      '#title' => $this->t('Number of products'),
      '#default_value' => $this->configuration['count'],
      '#min' => 1,
      '#max' => 20,
    ];
    return $form;
  }
  
  public function blockSubmit($form, FormStateInterface $form_state): void {
    $this->configuration['count'] = $form_state->getValue('count');
  }
  
  public function build(): array {
    $count = $this->configuration['count'];
    
    $storage = $this->entityTypeManager->getStorage('product');
    $query = $storage->getQuery()
      ->accessCheck(TRUE)
      ->sort('created', 'DESC')
      ->range(0, $count);
    
    $ids = $query->execute();
    $products = $storage->loadMultiple($ids);
    
    return [
      '#theme' => 'item_list',
      '#items' => array_map(
        fn($product) => $product->label(),
        $products
      ),
      '#cache' => [
        'tags' => ['product_list'],
        'contexts' => ['url.query_args'],
        'max-age' => 3600,
      ],
    ];
  }
}

<?php

namespace Drupal\mymodule;

use Drupal\Core\Config\ConfigFactoryInterface;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Drupal\Core\Logger\LoggerChannelFactoryInterface;
use Psr\Log\LoggerInterface;

/**
 * Service for managing products.
 */
class ProductManager {
  
  protected LoggerInterface $logger;
  
  public function __construct(
    protected EntityTypeManagerInterface $entityTypeManager,
    protected ConfigFactoryInterface $configFactory,
    LoggerChannelFactoryInterface $loggerFactory
  ) {
    $this->logger = $loggerFactory->get('mymodule');
  }
  
  /**
   * Creates a new product.
   *
   * @param array $values
   *   The product values.
   *
   * @return \Drupal\mymodule\Entity\Product
   *   The created product entity.
   */
  public function createProduct(array $values) {
    try {
      $product = $this->entityTypeManager
        ->getStorage('product')
        ->create($values);
      
      $product->save();
      
      $this->logger->info('Product created: @name', [
        '@name' => $product->label(),
      ]);
      
      return $product;
    }
    catch (\Exception $e) {
      $this->logger->error('Failed to create product: @message', [
        '@message' => $e->getMessage(),
      ]);
      throw $e;
    }
  }
}

services:
  mymodule.product_manager:
    class: Drupal\mymodule\ProductManager
    arguments:
      - '@entity_type.manager'
      - '@config.factory'
      - '@logger.factory'

<?php

namespace Drupal\mymodule\Controller;

use Drupal\Core\Controller\ControllerBase;
use Drupal\mymodule\ProductManager;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Returns responses for My Module routes.
 */
class ProductController extends ControllerBase {
  
  public function __construct(
    protected ProductManager $productManager
  ) {}
  
  public static function create(ContainerInterface $container): self {
    return new self(
      $container->get('mymodule.product_manager')
    );
  }
  
  /**
   * Displays a list of products.
   */
  public function list(): array {
    $products = $this->productManager->getRecentProducts(10);
    
    return [
      '#theme' => 'mymodule_product_list',
      '#products' => $products,
      '#cache' => [
        'tags' => ['product_list'],
        'contexts' => ['user.permissions'],
        'max-age' => 3600,
      ],
    ];
  }
}

mymodule.product_list:
  path: '/products'
  defaults:
    _controller: '\Drupal\mymodule\Controller\ProductController::list'
    _title: 'Products'
  requirements:
    _permission: 'access content'

<?php

namespace Drupal\Tests\mymodule\Kernel;

use Drupal\KernelTests\KernelTestBase;
use Drupal\mymodule\Entity\Product;

/**
 * Tests the Product entity.
 *
 * @group mymodule
 */
class ProductTest extends KernelTestBase {
  
  protected static $modules = ['mymodule', 'user', 'system'];
  
  protected function setUp(): void {
    parent::setUp();
    $this->installEntitySchema('product');
    $this->installEntitySchema('user');
  }
  
  /**
   * Tests product creation.
   */
  public function testProductCreation(): void {
    $product = Product::create([
      'name' => 'Test Product',
      'price' => 99.99,
    ]);
    $product->save();
    
    $this->assertNotEmpty($product->id());
    $this->assertEquals('Test Product', $product->label());
    $this->assertEquals(99.99, $product->get('price')->value);
  }
}

# Run module tests
vendor/bin/phpunit -c core modules/custom/mymodule

# Run specific test group
vendor/bin/phpunit -c core --group mymodule

# Run with coverage
vendor/bin/phpunit -c core --coverage-html reports modules/custom/mymodule

# Check coding standards
vendor/bin/phpcs --standard=Drupal,DrupalPractice modules/custom/mymodule

# Fix coding standards automatically
vendor/bin/phpcbf --standard=Drupal modules/custom/mymodule

# Clear all caches
drush cr

# Export configuration
drush config:export

# Import configuration
drush config:import

# Update database
drush updatedb

# Generate boilerplate code
drush generate module
drush generate plugin:block
drush generate controller

# Enable/disable modules
drush pm:enable mymodule
drush pm:uninstall mymodule

# Run migrations
drush migrate:import migration_id

# View watchdog logs
drush watchdog:show