Based on [this advice](https://github.com/gregbell/active_admin/pull/2911#issuecomment-33625110), I put undecoration logic in the [controller](https://github.com/gregbell/active_admin/pull/2912/files#diff-66792b4da2af0c613c06ca82bad029e4L1). However, even using `helper_method` does not help us access it here. Should I make it class level and access it as `ActiveAdmin::ResourceController::Decorators.undecorate_resource(resource)`?