application_controller.rb

# Filters added to this controller apply to all controllers in the application.
# Likewise, all the methods added will be available for all controllers.

class ApplicationController < ActionController::Base
  helper :all # include all helpers, all the time
  protect_from_forgery # See ActionController::RequestForgeryProtection for details

  # Scrub sensitive parameters from your log
  filter_parameter_logging :password, :password_confirmation
  
  helper_method :current_user, :current_user_session
  
  private
  
	def current_user_session
		return @current_user_session if defined?(@current_user_session)
		@current_user_session = UserSession.find
	end

	def current_user
		return @current_user if defined?(@current_user)
		@current_user = current_user_session && current_user_session.record
	end
  
    def require_user
      unless current_user
        store_location
        flash[:notice] = "You must be logged in to access this page"
        redirect_to new_user_session_url
        return false
      end
    end

    def require_no_user
      if current_user
        store_location
        flash[:notice] = "You must be logged out to access this page"
        redirect_to user_url( :current )
        return false
      end
    end
    
    def store_location
      session[:return_to] = request.request_uri
    end

    def clear_location
      session[:return_to] = nil
    end
	
    def redirect_back_or_default(default)
      redirect_to(session[:return_to] || default)
      session[:return_to] = nil
    end  
end