2 files changed, 24 insertions, 2 deletions
diff --git a/actionpack/lib/action_controller/routing/recognition_optimisation.rb b/actionpack/lib/action_controller/routing/recognition_optimisation.rb
index 6d54d0334c..4935432d87 100644
--- a/actionpack/lib/action_controller/routing/recognition_optimisation.rb
+++ b/actionpack/lib/action_controller/routing/recognition_optimisation.rb
@@ -134,6 +134,9 @@ module ActionController
         def write_recognize_optimized!
           tree = segment_tree(routes)
           body = generate_code(tree)
+
+          remove_recognize_optimized!
+
           instance_eval %{
             def recognize_optimized(path, env)
               segments = to_plain_segments(path)
@@ -147,6 +150,25 @@ module ActionController
             end
           }, __FILE__, __LINE__
         end
+
+        def clear_recognize_optimized!
+          remove_recognize_optimized!
+
+          class << self
+            def recognize_optimized(path, environment)
+              write_recognize_optimized!
+              recognize_optimized(path, environment)
+            end
+          end
+        end
+
+        def remove_recognize_optimized!
+          if respond_to?(:recognize_optimized)
+            class << self
+              remove_method :recognize_optimized
+            end
+          end
+        end
     end
   end
 end
diff --git a/actionpack/lib/action_controller/routing/route_set.rb b/actionpack/lib/action_controller/routing/route_set.rb
index 9d48f289db..ff448490e9 100644
--- a/actionpack/lib/action_controller/routing/route_set.rb
+++ b/actionpack/lib/action_controller/routing/route_set.rb
@@ -195,7 +195,7 @@ module ActionController
         self.routes = []
         self.named_routes = NamedRouteCollection.new
 
-        write_recognize_optimized!
+        clear_recognize_optimized!
       end
 
       # Subclasses and plugins may override this method to specify a different
@@ -217,7 +217,7 @@ module ActionController
         @routes_by_controller = nil
         # This will force routing/recognition_optimization.rb
         # to refresh optimisations.
-        @compiled_recognize_optimized = nil
+        clear_recognize_optimized!
       end
 
       def install_helpers(destinations = [ActionController::Base, ActionView::Base], regenerate_code = false)