Add notification level user preference when replying to a topic

app/models/notification_level_when_replying_site_setting.rb

@@ -0,0 +1,26 @@
+require_dependency 'enum_site_setting'
+require_dependency 'notification_levels'
+
+class NotificationLevelWhenReplyingSiteSetting < EnumSiteSetting
+
+  def self.valid_value?(val)
+    val.to_i.to_s == val.to_s &&
+    values.any? { |v| v[:value] == val.to_i }
+  end
+
+  def self.notification_levels
+    NotificationLevels.topic_levels
+  end
+
+  def self.values
+    @values ||= [
+      { name: 'topic.notifications.watching.title', value: notification_levels[:watching] },
+      { name: 'topic.notifications.tracking.title', value: notification_levels[:tracking] }
+    ]
+  end
+
+  def self.translate_names?
+    true
+  end
+
+end