When a route references a missing controller, raise ActionController::RoutingError with a clearer message

1 files changed, 7 insertions, 3 deletions

diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index 11228c597d..15a6415342 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -556,9 +556,13 @@ module ActionDispatch
             dispatcher = dispatcher.app
           end
 
-          if dispatcher.is_a?(Dispatcher) && dispatcher.controller(params, false)
-            dispatcher.prepare_params!(params)
-            return params
+          if dispatcher.is_a?(Dispatcher)
+            if dispatcher.controller(params, false)
+              dispatcher.prepare_params!(params)
+              return params
+            else
+              raise ActionController::RoutingError, "A route matches #{path.inspect}, but references missing controller: #{params[:controller].camelize}Controller"
+            end
           end
         end