Administrate::ResourceResolver always singularizes namespace.

Created by: timobleeker

• What were you trying to do? Make a dashboard for a namespaced resource: Users::Preference

• What did you end up with (logs, or, even better, example apps are great!)? uninitialized constant User::PreferenceDashboard

• What versions are you running?

  • Rails 6.0.3
  • administrate 0.13.0

From reading the source of the Administrate::ResourceResolver, it's always going to singularize the namespace:

    def controller_path_parts
      controller_path.split("/")[1..-1].map(&:singularize)
    end

I don't understand why it would want to signularize the namespace part of the controller path. To my knowledge it is not possible to have Foo::Bar in foos/bar.rb. Would it not make more sense to just singularize the last part of the controller path?

Am I missing something, or is this a bug in administrate?