title: Validation messages after redirect
body: <p>We have a form to submit ratings for a certain restaurant in a in our views/restaurants/show.html.erb. If there is a validation error we get redirected back to views/restaurants/show.html.erb but the validation messages do not appear. We figured out that this happens because we lose the messages using redirect_to(@restaurant) in our RatingController create action. But how can we get back without redirection? </p>
  
  <p>Thanks!</p>