From what I gather, +find(:all)+ in ActiveRecord is being deprecated in favor of +all+.
In ResourceController::Helpers::CurrentObjects line 17 has:
end_of_association_chain.find(:all)
which should read:
end_of_association_chain.all
This update is also compatible with using an ActiveHash model as the resource. It sounds like some people use DataMapper; I'm not sure how this would affect them.