2 files changed, 8 insertions, 5 deletions
diff --git a/actionpack/lib/action_dispatch/journey/formatter.rb b/actionpack/lib/action_dispatch/journey/formatter.rb
index cf755bfbeb..82c55660ea 100644
--- a/actionpack/lib/action_dispatch/journey/formatter.rb
+++ b/actionpack/lib/action_dispatch/journey/formatter.rb
@@ -1,3 +1,5 @@
+require 'action_controller/metal/exceptions'
+
 module ActionDispatch
   module Journey
     # The Formatter class is used for formatting URLs. For example, parameters
@@ -27,7 +29,10 @@ module ActionDispatch
           return [route.format(parameterized_parts), params]
         end
 
-        raise Router::RoutingError.new "missing required keys: #{missing_keys}"
+        message = "No route matches #{constraints.inspect}"
+        message << " missing required keys: #{missing_keys.inspect}" if name
+
+        raise ActionController::UrlGenerationError, message
       end
 
       def clear
diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index b1959e388c..931ad372a8 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -527,12 +527,10 @@ module ActionDispatch
           recall[:action] = options.delete(:action) if options[:action] == 'index'
         end
 
-        # Generates a path from routes, returns [path, params]
-        # if no path is returned the formatter will raise Journey::Router::RoutingError
+        # Generates a path from routes, returns [path, params].
+        # If no route is generated the formatter will raise ActionController::UrlGenerationError
         def generate
           @set.formatter.generate(:path_info, named_route, options, recall, PARAMETERIZE)
-        rescue Journey::Router::RoutingError => e
-          raise ActionController::UrlGenerationError, "No route matches #{options.inspect} #{e.message}"
         end
 
         def different_controller?