Rails - May 2010 - 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
http://api.rubyonrails.org/classes/ActiveRecord/Base.html)

According to you, how can we do so?

Many thanks.
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