Authlogic and Single table inheritance

Hi,

I have some models such as:

    class User < ActiveRecord::Base       acts_as_authentic     end

    class Admin < User     end

    class Superadmin < Admin     end

And some controllers such as:

    class UserSessionsController < ApplicationController       def new         @user_session = UserSession.new       end

      def create         @user_session = UserSession.new(params[:user_session])         if @user_session.save           flash[:notice] = t('user_sessions.flash.create.notice')           redirect_to root_path         else           render :action => :new         end       end

      def destroy         current_user_session.destroy         flash[:notice] = t('user_sessions.flash.destroy.notice')         redirect_to new_session_path       end     end

    class Admin::AdminSessionsController < ApplicationController       layout 'admin'

      def new         @user_session = UserSession.new       end

      def create         @user_session = UserSession.new(params[:user_session])         if @user_session.save           flash[:notice] = t('user_sessions.flash.create.notice')           redirect_to admin_dashboard_path         else           render :action => :new         end       end

      def destroy         current_user_session.destroy         flash[:notice] = t('user_sessions.flash.destroy.notice')         redirect_to new_admin_session_path       end     end

    class Superadmin::SuperadminSessionsController < ApplicationController       layout 'superadmin'

      def new         @user_session = UserSession.new       end

      def create         @user_session = UserSession.new(params[:user_session])         if @user_session.save           flash[:notice] = t('user_sessions.flash.create.notice')           redirect_to superadmin_dashboard_path         else           render :action => :new         end       end

      def destroy         current_user_session.destroy         flash[:notice] = t('user_sessions.flash.destroy.notice')         redirect_to new_superadmin_session_path       end     end

I would like to allow users to login, but only with the good controller and model. For instance, if an admin want to log in, its controller should be Admin::AdminSessionsController (handled Admin model).

But I don't want that, a user connect itself using another interface like superadmin (and the opposite).

I suppose that I need to add a condition in each controller just before @user_session.save. Maybe using @user_session.save... But I don't see exactly how.

I just know that, it's should be possible to know the type of current_user thanks to: current_user.type (as documented at ActiveRecord::Base)

According to you, how can we do so?

Many thanks.