application_controller.rb

class ApplicationController < ActionController::Base
  protect_from_forgery
  before_filter :set_locale
  helper_method :current_user

  private

  def current_user_session
    return @current_user_session if defined?(@current_user_session) && ! @current_user_session.blank?
    @current_user_session = UserSession.find
  end

  def current_user
    return @current_user if defined?(@current_user) && ! @current_user.blank?
    @current_user = current_user_session && current_user_session.user
  end

  def set_locale
    I18n.locale = 'ru'
  end

  def require_user
    unless current_user
      redirect_to login_url
      return false
    end
  end

  def require_no_user
    redirect_to user_url(current_user) if current_user
  end

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

  def store_location
    session[:return_to] = request.request_uri
  end
end