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/document.rb

@@ -30,6 +30,8 @@ class Document < ActiveRecord::Base
   validates_presence_of :project, :title, :category
   validates_length_of :title, :maximum => 60
 
+  after_create :send_notification
+
   scope :visible, lambda {|*args|
     includes(:project).where(Project.allowed_to_condition(args.shift || User.current, :view_documents, *args))
   }
@@ -54,4 +56,12 @@ class Document < ActiveRecord::Base
     end
     @updated_on
   end
+
+  private
+
+  def send_notification
+    if Setting.notified_events.include?('document_added')
+      Mailer.document_added(self).deliver
+    end
+  end
 end