application_controller.rb

class ApplicationController < ActionController::Base
  # force_ssl
  protect_from_forgery

  helper_method :current_user

  def signed_in
    @signed_in = true unless session[:user_id] == nil
  end

  private

  def current_user
    @current_user ||= User.where(:id => :session[:user_id]).first if session[:user_id]
  end
end