ruby on rails - Redirect to previous page wherever it is directed to the login page -

i'm using rails 3.2 , authlogic. have following code:

class applicationcontroller < actioncontroller::base   private    def store_location     session[:return_to] = request.url   end    def redirect_back_or_default(default)     redirect_to(session[:return_to] || default)     session[:return_to] = nil   end end  class usersessionscontroller < applicationcontroller     before_filter :require_no_user, :only => [:new, :create]   before_filter :require_user, :only => :destroy    def new     @user_session = usersession.new     @header_title = "login"   end    def create     @user_session = usersession.new(params[:user_session])     if @user_session.save       flash[:success] = "login successful!"       redirect_back_or_default root_url     else       render 'new'     end   end    def destroy     current_user_session.destroy     flash[:success] = "logout successful!"     redirect_back_or_default root_url   end end 

this code quite generic. when use before_filter:

  before_filter :require_user, :only => [:new, :edit, :update, :create] 

it automatically store_location , redirect proper page. however, how do this:

1. i'm in posts/1 doesn't require_user.
2. i click login link on top navigation bar.
3. it shows login page.
4. once login, redirected posts/1 instead of root_url.

place direct call store_location in sessions controller new action.

# user_sessions_controller.rb def new   store_location if session[:return_to].blank?   @user_session = usersession.new   @header_title = "login" end 

this first check existing return_to pair in sessions hash. don't want overwrite in case, example, user redirected new action because of bad password.

this skip store_location if called require_user.

after successful redirect, have delete return_to pair sessions hash; setting nil not enough:

  # application_controller.rb   def redirect_back_or_default(default)     redirect_to(session.delete(:return_to) || default)   end