Convert settings to DSL

app/models/setting/notification_send.rb

-# frozen_string_literal: true
-
-class Setting
-  class NotificationSend < ::Setting
-    def self.default_settings
-      [
-        set('notification_send_enable', _('Enable'), false, N_('Enable')),
-        set('notification_send_target_url', _('Target URI'), 'https://matrix.org', N_('Target URI')),
-        set('notification_send_target_room', _('Target Room'), '#test:matrix.org', N_('Target Room')),
-        set('notification_send_token', _('Token'), 'abcdefg', N_('Token'))
-      ]
-    end
-
-    def self.load_defaults
-      # Check the table exists
-      return unless super
-
-      transaction do
-        default_settings.each do |s|
-          create! s.update(category: 'Setting::NotificationSend')
-        end
-      end
-
-      true
-    end
-
-    def self.humanized_category
-      N_('Notification Send')
-    end
-  end
-end

db/migrate/20230313105520_convert_settings_to_dsl.rb

+# frozen_string_literal: true
+
+class ConvertSettingsToDsl < ActiveRecord::Migration[6.0]
+  def up
+    # rubocop:disable Rails/SkipsModelValidations
+    Settings.where(category: 'Setting::NotificationSend').update_all(category: 'Setting')
+    # rubocop:enable Rails/SkipsModelValidations
+  end
+end

lib/foreman_notification_send/engine.rb

@@ -13,18 +13,37 @@ module ForemanNotificationSend
       end
     end
 
-    initializer 'foreman_ipxe.load_default_settings', before: :load_config_initializers do
-      require_dependency File.expand_path('../../app/models/setting/notification_send.rb', __dir__) if \
-        begin
-          Setting.table_exists?
-        rescue StandardError
-          (false)
-        end
-    end
-
     initializer 'foreman_notification_send.register_plugin', before: :finisher_hook do |_app|
       Foreman::Plugin.register :foreman_notification_send do
-        requires_foreman '>= 1.16'
+        requires_foreman '>= 3.0'
+
+        settings do
+          category :notification_send, N_('Notification Send') do
+            setting 'notification_send_enable',
+                    type: :boolean,
+                    description: N_('Enable'),
+                    default: false,
+                    full_name: N_('Enable')
+
+            setting 'notification_send_target_url',
+                    type: :string,
+                    description: N_('Target URI'),
+                    default: 'https://matrix.org',
+                    full_name: N_('Target URI')
+
+            setting 'notification_send_target_room',
+                    type: :string,
+                    description: N_('Target Room'),
+                    default: '#test:matrix.org',
+                    full_name: N_('Target Room')
+
+            setting 'notification_send_token',
+                    type: :string,
+                    description: N_('Token'),
+                    default: 'syt_abcdefg',
+                    full_name: N_('Token')
+          end
+        end
       end
     end