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+---
+title: Drupal Bundle classes
+date: 2025-07-12 23:25:52
+tags:
+  - drupal
+  - php
+---
+
+By overridding a given bundle type:
+
+```php
+<?php
+
+// modules/opd_presentations/opd_presentations.module
+
+function opd_presentations_entity_bundle_info_alter(array &$bundles): void {
+  if (isset($bundles['node'])) {
+    $bundles['node'][Presentation::NODE_TYPE]['class'] = Presentation::class;
+  }
+
+  if (isset($bundles['paragraph'])) {
+    $bundles['paragraph'][Event::PARAGRAPH_TYPE]['class'] = Event::class;
+  }
+}
+```
+
+I can write my own bundle classes that extend `Node`, `Paragraph`, etc, with its own custom methods and behaviour.
+
+```php
+<?php
+
+// modules/opd_presentations/src/Presentation.php
+
+declare(strict_types=1);
+
+namespace Drupal\opd_presentations;
+
+use Drupal\paragraphs\Entity\Paragraph;
+use Drupal\paragraphs\ParagraphInterface;
+
+final class Event extends Paragraph implements ParagraphInterface {
+
+  public const PARAGRAPH_TYPE = 'event';
+
+  public function getEventDate(): string {
+    /** @var non-empty-string */
+    return $this->get('field_date')->value;
+  }
+
+  public function getEventName(): string {
+    /** @var non-empty-string */
+    return $this->get('field_event_name')->value;
+  }
+
+  public function isPast(): bool {
+    return $this->getEventDate() < strtotime('today');
+  }
+
+}
+```