always dispatch to controllers the same way

controllers should always go through the `action` class method so that
their middleware is respected.

2 files changed, 25 insertions, 7 deletions

diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index c3a9422ceb..1acfb2bfe8 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -283,12 +283,16 @@ module ActionDispatch
           end
 
           def app(blocks)
-            if to.respond_to?(:call)
-              Constraints.new(to, blocks, Constraints::CALL)
-            elsif blocks.any?
-              Constraints.new(dispatcher(defaults.key?(:controller)), blocks, Constraints::SERVE)
+            if to.is_a?(Class) && to < ActionController::Metal
+              Routing::RouteSet::StaticDispatcher.new to
             else
-              dispatcher(defaults.key?(:controller))
+              if to.respond_to?(:call)
+                Constraints.new(to, blocks, Constraints::CALL)
+              elsif blocks.any?
+                Constraints.new(dispatcher(defaults.key?(:controller)), blocks, Constraints::SERVE)
+              else
+                dispatcher(defaults.key?(:controller))
+              end
             end
           end
 
diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index 065df09f8b..c026d0e2d9 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -28,8 +28,7 @@ module ActionDispatch
 
         def serve(req)
           params = req.path_parameters
-          controller = req.controller_class
-          dispatch(controller, params[:action], req)
+          dispatch(controller(req), params[:action], req)
         rescue NameError => e
           if @raise_on_name_error
             raise ActionController::RoutingError, e.message, e.backtrace
@@ -40,11 +39,26 @@ module ActionDispatch
 
       private
 
+        def controller(req)
+          req.controller_class
+        end
+
         def dispatch(controller, action, req)
           controller.action(action).call(req.env)
         end
       end
 
+      class StaticDispatcher < Dispatcher
+        def initialize(controller_class)
+          super(false)
+          @controller_class = controller_class
+        end
+
+        private
+
+        def controller(_); @controller_class; end
+      end
+
       # A NamedRouteCollection instance is a collection of named routes, and also
       # maintains an anonymous module that can be used to install helpers for the
       # named routes.