ブログ初回公開のみ通知するよう条件分岐を修正

app/models/article_notifier.rb

@@ -3,7 +3,7 @@
 class ArticleNotifier
   def call(payload)
     article = payload[:article]
-    return if article.wip?
+    return unless article.saved_change_to_attribute?(:published_at, from: nil)
 
     receivers = User.students_trainees_mentors_and_admins.reject { |receiver| receiver == article.user }
     send_notification(article:, receivers:)