Schedule announcement job in migrations

app/workers/announcements/scheduler_job.rb

@@ -0,0 +1,41 @@
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) 2012-2021 the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+module Announcements
+  class SchedulerJob < ::ApplicationJob
+    queue_with_priority :low
+
+    def perform(**announcement)
+      User.active.find_each do |user|
+        AnnouncementMailer
+          .announce(user, **announcement)
+          .deliver_later
+      end
+    end
+  end
+end

db/migrate/20211105142202_queue_notification_update_mail.rb

@@ -1,13 +1,9 @@
 class QueueNotificationUpdateMail < ActiveRecord::Migration[6.1]
   def up
-    User.active.find_each do |user|
-      AnnouncementMailer
-        .announce(user,
-                  subject: I18n.t(:'notifications.update_info_mail.subject'),
+    ::Announcements::SchedulerJob
+      .perform_later subject: I18n.t(:'notifications.update_info_mail.subject'),
                      body: I18n.t(:'notifications.update_info_mail.body'),
                      body_header: I18n.t(:'notifications.update_info_mail.body_header'),
-                  body_subheader: I18n.t(:'notifications.update_info_mail.body_subheader'))
-        .deliver_later
-    end
+                     body_subheader: I18n.t(:'notifications.update_info_mail.body_subheader')
   end
 end