3 files changed, 31 insertions, 18 deletions
diff --git a/railties/lib/rails/application.rb b/railties/lib/rails/application.rb
index 817fa39cab..0b72a7ed84 100644
--- a/railties/lib/rails/application.rb
+++ b/railties/lib/rails/application.rb
@@ -141,6 +141,10 @@ module Rails
       self
     end
 
+    def helpers_paths
+      config.helpers_paths
+    end
+
   protected
 
     alias :build_middleware_stack :app
diff --git a/railties/lib/rails/engine.rb b/railties/lib/rails/engine.rb
index d652c6b7fe..335a0fb1b5 100644
--- a/railties/lib/rails/engine.rb
+++ b/railties/lib/rails/engine.rb
@@ -371,20 +371,28 @@ module Rails
         self.routes.default_scope = { :module => ActiveSupport::Inflector.underscore(mod.name) }
         self.isolated = true
 
-        unless mod.respond_to?(:_railtie)
-          name = engine_name
-          _railtie = self
+        unless mod.respond_to?(:railtie_namespace)
+          name, railtie = engine_name, self
+
           mod.singleton_class.instance_eval do
-            define_method(:_railtie) do
-              _railtie
-            end
+            define_method(:railtie_namespace) { railtie }
 
             unless mod.respond_to?(:table_name_prefix)
-              define_method(:table_name_prefix) do
-                "#{name}_"
-              end
+              define_method(:table_name_prefix) { "#{name}_" }
+            end
+
+            unless mod.respond_to?(:use_relative_model_naming?)
+              class_eval "def use_relative_model_naming?; true; end", __FILE__, __LINE__
+            end
+
+            unless mod.respond_to?(:railtie_helpers_paths)
+              define_method(:railtie_helpers_paths) { railtie.helpers_paths }
+            end
+
+            unless mod.respond_to?(:railtie_routes_url_helpers)
+              define_method(:railtie_routes_url_helpers) { railtie.routes_url_helpers }
             end
-         end
+          end
         end
       end
 
@@ -429,13 +437,6 @@ module Rails
     def helpers
       @helpers ||= begin
         helpers = Module.new
-
-        helpers_paths = if config.respond_to?(:helpers_paths)
-          config.helpers_paths
-        else
-          paths["app/helpers"].existent
-        end
-
         all = ActionController::Base.all_helpers_from_path(helpers_paths)
         ActionController::Base.modules_for_helpers(all).each do |mod|
           helpers.send(:include, mod)
@@ -444,6 +445,14 @@ module Rails
       end
     end
 
+    def helpers_paths
+      paths["app/helpers"].existent
+    end
+
+    def routes_url_helpers
+      routes.url_helpers
+    end
+
     def app
       @app ||= begin
         config.middleware = config.middleware.merge_into(default_middleware_stack)
diff --git a/railties/lib/rails/railtie.rb b/railties/lib/rails/railtie.rb
index e8fb1f3d98..f0991b99af 100644
--- a/railties/lib/rails/railtie.rb
+++ b/railties/lib/rails/railtie.rb
@@ -196,7 +196,7 @@ module Rails
     end
 
     def railtie_namespace
-      @railtie_namespace ||= self.class.parents.detect { |n| n.respond_to?(:_railtie) }
+      @railtie_namespace ||= self.class.parents.detect { |n| n.respond_to?(:railtie_namespace) }
     end
   end
 end