Redirect To Current Page After Login Discussion

exactly what I needed

I can understand this episode.But I have a question.
if I add this code to posts_controller.rb. how to redirect the current page after we login

 # posts_controller.rb
 before_action :authenticate_user!, except: [:index, :show]

I click /posts/1/edit when I am not login. it will require me to login. when I login in.I can't redirect_to /posts/1/edit

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