I like it, routing via :modules is very elegant. It works for me in a normal rails application, but i can't get it work inside of a rails engine.

config/routes.rb from the engine:

Wobauth::Engine.routes.draw do
  resources :users do
    resources :authorities, module: :users
  end
end

Controllers:

module Wobauth
  class Users::AuthoritiesController < AuthoritiesController
  ...
  end
end

module Wobauth
  class AuthoritiesController < ApplicationController
   ...
  end
end

I get the following error:

uninitialized constant Authority
Extracted source (around line #269):
      names.inject(Object) do |constant, name|
        if constant == Object
          constant.const_get(name)
        else
          candidate = constant.const_get(name)
          next candidate if constant.const_defined?(name, false)

It works without specifying :modules, but this means i must place the logic in the main authorities_controller ... so its less elegant. Any idea?

Wolfgang.

Yeah, found it. The problem comes from cancancan/lib/cancan/controller_resource.rb in 

    def resource_class
      case @options[:class]
      when false
        name.to_sym
      when nil
        namespaced_name.to_s.camelize.constantize
      when String
        @options[:class].constantize
      else
        @options[:class]
      end
    end

The error cames from namespaced_name.to_s.camelize.constantize, which resolves to "Authority". I now set

module Wobauth
  class AuthoritiesController < ApplicationController
    skip_load_and_authorize_resource
    load_and_authorize_resource class: Wobauth::Authority
...

This sets the class name manually. Seems to work now. Thank you for the idea ;-)

def set_tags_from_input
  return if self.tag_list_input.nil?
  ...
end