onboarding_controller.rb

module Portal::V2
    class OnboardingController < PortalController
        skip_filter :enforce_user_session!, only: [:index, :debug]


        def index
           # we never get here
        end
   end
end

portal_controller.rb

module Portal::V2
    class PortalController < ApplicationController
        before_filter :enforce_user_session!
        skip_before_action :verify_authenticity_token

        private
        def enforce_user_session!
            redirect_to "http://google.com"
            return false
            # we see this
        end
    end
end