redirect_back_or_default.rb

class ApplicationController < ActionController::Base
  helper :all # include all helpers, all the time
  protect_from_forgery
  
  private
    def require_user
      unless @current_user
        store_location
        flash[:notice] = "You must be logged in to access this page"
        redirect_to login_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 logout_url
        return false
      end
    end

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

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

end