Extract helper methods

web/modules/custom/blog/opdavies_blog.install

@@ -7,7 +7,6 @@
 
 declare(strict_types=1);
 
-use Drupal\opdavies_blog\Entity\Post;
 use Drupal\opdavies_blog\Repository\PostRepository;
 
 /**
@@ -17,7 +16,7 @@ function opdavies_blog_update_8001(): void {
   $posts = \Drupal::service(PostRepository::class)->getAll();
 
   foreach ($posts as $post) {
-    $post->set(Post::FIELD_SENT_TO_SOCIAL_MEDIA, TRUE);
+    $post->markAsSentToSocialMedia();
     $post->save();
   }
 }

web/modules/custom/blog/src/Entity/Node/Post.php

@@ -51,6 +51,12 @@ class Post extends Node implements ContentEntityBundleInterface {
     return (bool) $this->getExternalLink();
   }
 
+  public function markAsSentToSocialMedia(): self {
+    $this->set(self::FIELD_SENT_TO_SOCIAL_MEDIA, TRUE);
+
+    return $this;
+  }
+
   public function setTags(array $tags): void {
     $this->set(self::FIELD_TAGS, $tags);
   }

web/modules/custom/blog/src/EventSubscriber/PushBlogPostToSocialMedia.php

@@ -76,7 +76,7 @@ final class PushBlogPostToSocialMedia implements EventSubscriberInterface {
       ],
     ]);
 
-    $entity->set(Post::FIELD_SENT_TO_SOCIAL_MEDIA, TRUE);
+    $entity->markAsSentToSocialMedia();
     $entity->save();
   }