Railsã§ä½ã£ã¦ã¦ã³ã³ããã¼ã©ã¼ã§å ¥åãã§ãã¯ãããããå ´åãããã¾ãã åºæ¬çã«ããå ¥åããããã©ã¡ã¼ã¿ãé©åããã£ã¦ã®ã¯ã¢ãã«ã§ç®¡çãããã§ããããã§ããMVCã®åºæ¬ã§ãã ãã å ¥åããããã©ã¡ã¼ã¿ãåå¨ãããã¨ããAjaxã§ã®ãªã¯ã¨ã¹ãããåãä»ããããªãã¨ããã¢ãã«ä»¥åã«ã³ã³ããã¼ã©ã¼ã§å¶éãå ãããå ´åã£ã¦ããã¨æãã®ã§ããï¼ ãããªã¨ãã®æ¹æ³ããç´¹ä»ãã¾ãã 対象ã¯Rails2.3.x ã§ãã é常ã ã¨ã³ã³ããã¼ã©ã¼ã®ã¢ã¯ã·ã§ã³ã¡ã½ããã¯ä»¥ä¸ã®ãããªæãã«ãªããã¨æãã¾ãã class TopicsController < ApplicationController def index unless params[:category] flash[:notice] = "ã«ãã´ãªã¼ã鏿ãã¦ãã ãã" redirect_to :controller => "root" ret


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