warning: toplevel constant SomeController referenced by Admin::SomeController

This issue has been discussed before (http://www.ruby-forum.com/topic/
125392) and after spending a while debugging through this, I still
don't have a solution. Lets try again?

I have two controllers, SomeController and Admin::SomeController. When
SomeController is loaded first (which happens under spork, found out
by editing ActiveSupport::AbstractController) I get warning: toplevel
constant SomeController referenced by Admin::SomeController and the
second controller is not loaded. The first controller is polluting
something for the namespaced controller.

I have a rather large project where this happens, so I can't post it.
But I have a 100% repro, so I'd be happy to do some debugging.

Help?

Is Admin a class or a module? If it's a class it's due to the fact that const_missing searches for constants in ancestors which includes Object when Admin is a class. Since SomeController is defined already in Object it will return that constant along with the warning message. If Admin is a module then the ancestor list is just itself.

A couple of ways to workaround the problem, either make Admin a module if possible or nest the public-facing controllers under a different namespace, e.g. Admin::SomeController and Front::SomeController.

Andrew