Add a Presentation bundle class

Drupal core issue: https://www.drupal.org/node/2570593
Change record: https://www.drupal.org/node/3191609

config/sync/core.extension.yml

@@ -49,6 +49,7 @@ module:
   node: 0
   opd_daily_emails: 0
   opd_podcast: 0
+  opd_presentations: 0
   options: 0
   page_cache: 0
   path: 0

modules/opd_presentations/opd_presentations.module

@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+use Drupal\opd_presentations\Entity\Presentation;
+
+/**
+ * Implements hook_entity_bundle_info_alter().
+ *
+ * @param array<non-empty-string, array{class: non-empty-string}> $bundles
+ */
+function opd_presentations_entity_bundle_info_alter(array &$bundles): void {
+  if (isset($bundles['node'])) {
+    $bundles['node']['presentation']['class'] = Presentation::class;
+  }
+}

modules/opd_presentations/src/Entity/Presentation.php

@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\opd_presentations\Entity;
+
+use Drupal\node\Entity\Node;
+use Drupal\node\NodeInterface;
+
+final class Presentation extends Node implements NodeInterface {
+
+  public function getPastEvents(): array {
+    return $this->get('field_events')->referencedEntities();
+  }
+
+}

modules/opd_presentations/tests/src/DrupalTestTraits/Entity/PresentationTest.php

@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\opd_presentations\DrupalTestTraits\Entity;
+
+use Drupal\paragraphs\Entity\Paragraph;
+use Drupal\opd_presentations\Entity\Presentation;
+use weitzman\DrupalTestTraits\ExistingSiteBase;
+
+final class PresentationTest extends ExistingSiteBase {
+
+  public function test_getting_past_events(): void {
+    $presentation = $this->createPresentation(
+      events: [
+        Paragraph::create(['type' => 'event']),
+      ],
+    );
+
+    $this->assertCount(
+      expectedCount: 1,
+      haystack: $presentation->getPastEvents(),
+    );
+  }
+
+  /**
+   * @param ParagraphInterface[] $events
+   */
+  private function createPresentation(array $events): Presentation {
+    return $this->createNode([
+      'field_events' => $events,
+      'type' => 'presentation',
+    ]);
+  }
+}