Devise redirect back to the original location after sign in or sign up?

Here I'm using Devise Gem for authentication. If someone want to open page without login then it redirect to sign_in page and after signed in it back to the page which user try to open. I use Redirect loop with Devise after_sign_in_path_for link for my problem but it does not work for me.

 def after_sign_in_path_for(resource)
   params[:next] || super 
 end

It doesn't redirect back me to the page which I want to open. for example: If I want to open "127.0.0.1:3000/post/2/edit", it doest not back to this page after signed in.