How to redirect to previous page in Ruby On Rails?

I have a page that lists all of the projects that has sortable headers and pagination. path: /projects?order=asc&page=3&sort=code I choose to edit one of the projects path: projects/436/edit When I click save on that page, it calls the projects controller / update method. After I update the code I want to redirect to the path that I was on before I clicked edit a specific project. In other words,

[kiyo_hiko]

controller.rb → before do; ＠back = request.referer; end、view.haml → - unless ＠back.nil? \n %a{:href => ＠back}= やり直す、とかすっきり書けた

[pentiumx]

“session[:return_to] ||= request.referer”