Binarylogic Authlogic

My User class has a boolean field named "enabled". I'd like to prevent the login if that field is set to false. I found here an example code:
http://rdoc.info/rdoc/binarylogic/authlogic/blob/72992b9effaea12f10...

class UserSession

validate :check_if_awesome

private
  def check_if_awesome
    errors.add(:login, "must contain awesome") if login && !login.include?("awesome")
    errors.add(:base, "You must be awesome to log in") unless attempted_record.awesome?
  end

end

that I've adapted into this:

class UserSession < Authlogic::Session::Base

validate :check_if_user_enabled

private
    def check_if_user_enabled
        debugger
#        User.find_by_login(object.login).enabled
    end

end

so, why does UserSession doesn't inherit from Authlogic::Session::Base ?
Moreover, using the debugger I can't see the "errors" object, I can only access to it by "object.errors".

so, if I'm not doing anything wrong, the problem in this ticket should only be about syncing this to the documentation.

Maurizio De Magnis