1 files changed, 10 insertions, 0 deletions
diff --git a/railties/lib/rails/engine.rb b/railties/lib/rails/engine.rb
index cc878ac8f2..6f724963b2 100644
--- a/railties/lib/rails/engine.rb
+++ b/railties/lib/rails/engine.rb
@@ -73,6 +73,16 @@ module Rails
       end
     end
 
+    initializer :add_routing_namespaces do |app|
+      config.paths.app.controllers.to_a.each do |load_path|
+        load_path = File.expand_path(load_path)
+        Dir["#{load_path}/*/*_controller.rb"].collect do |path|
+          namespace = File.dirname(path).sub(/#{load_path}\/?/, '')
+          app.routes.controller_namespaces << namespace unless namespace.empty?
+        end
+      end
+    end
+
     initializer :add_locales do
       config.i18n.load_path.unshift(*config.paths.config.locales.to_a)
     end