え、無いの?ということで調べてみると... どうやら "link_to_remote" がなくなり "link_to" , "button_to" などに ":remote = true" オプションで実装するらしい。 :remote => true - This will allow the unobtrusive JavaScript driver to make an Ajax request to the URL in question instead of following the link. The drivers each provide mechanisms for listening for the completion of the Ajax request and performing JavaScript operations once they’re compl