Use AR callbacks instead of observers (removed in Rails4) for notifications.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@12021 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/message.rb

@@ -45,6 +45,7 @@ class Message < ActiveRecord::Base
   after_create :add_author_as_watcher, :reset_counters!
   after_update :update_messages_board
   after_destroy :reset_counters!
+  after_create :send_notification
 
   scope :visible, lambda {|*args|
     includes(:board => :project).where(Project.allowed_to_condition(args.shift || User.current, :view_messages, *args))
@@ -105,4 +106,10 @@ class Message < ActiveRecord::Base
   def add_author_as_watcher
     Watcher.create(:watchable => self.root, :user => author)
   end
+
+  def send_notification
+    if Setting.notified_events.include?('message_posted')
+      Mailer.message_posted(self).deliver
+    end
+  end
 end