we should be checking if the app is a class

Hopefully `object.class` always returns something that is_a?(Class), so
the previous logic didn't really make sense.

1 files changed, 1 insertions, 1 deletions

diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index 6419c17be9..e77f6286ea 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -610,7 +610,7 @@ module ActionDispatch
             if app.respond_to?(:railtie_name)
               app.railtie_name
             else
-              class_name = app.class.is_a?(Class) ? app.name : app.class.name
+              class_name = app.is_a?(Class) ? app.name : app.class.name
               ActiveSupport::Inflector.underscore(class_name).tr("/", "_")
             end
           end