It seems that since Administrate v0.18.0, the search processing part has been separated into filter_resources. Since Ransack is also part of the filter family, I think it would be smarter to move it to filter_resources rather than keeping it under scoped_resource. What do you think?

https://github.com/thoughtbot/administrate/blob/v0.18.0/app/controllers/administrate/application_controller.rb#L82-L88