AdminController中的AbstractController :: DoubleRenderError

我正在进行狂欢商务，我正在尝试调整active_sale_controller中的几个动作。 我有一些条件，如果条件失败，我会重定向（后退），否则我将继续下一步。 我现在面临的问题是我在同一个动作中使用了redirected_to（：back）两次，并且在同一个动作中我还有一个redirected_to到另一个控制器，浏览器显示一个错误，表示

"Render and/or redirect were called multiple times in this action. Please note that you may only call render OR redirect, and at most once per action. Also note that neither redirect nor render terminate execution of the action, so if you want to exit an action after redirecting, you need to do something like "redirect_to(...) and return"." 

这是我的代码

 when "2" st_days = DateTime.strptime("#{start_date}","%d/%m/%Y %H:%M:%S") ed_days = DateTime.strptime("#{end_date}","%d/%m/%Y %H:%M:%S") ps = PoSale.where(:active_sale_id => @active_sale.id, :event_name => @taxon_name,:st_date => @start_date, :ed_date => @end_date).last if ((st_days >= ps.st_date and st_days = ps.st_date and ed_days  "problem with the start_date and end_date" else PoSale.create(:active_sale_id => params[:id], :event_name => params[:active_sale]["taxon_name"], :st_date => DateTime.strptime("#{start_date}","%d/%m/%Y %H:%M:%S"), :ed_date => DateTime.strptime("#{end_date}","%d/%m/%Y %H:%M:%S")) end when "3" puts "Inside 3" puts "*"*20 #hidesd = DateTime.parse(params[:hide_start_date].split("+")[0]) #hideed = DateTime.parse(params[:hide_end_date].split("+")[0]) # hideed = DateTime.strptime("#{hide_end_date}","%d/%m/%Y %H:%M:%S") puts "*"*20 #puts "Parameters:#{hidesd}" #puts hideed a_sale_id=params[:id].to_i #PoSale.where("active_sale_id = 310 and st_date = '2012-07-05 03:03:00' and ed_date ='2012-07-12 08:03:00'") st_days = DateTime.strptime("#{start_date}","%d/%m/%Y %H:%M:%S") ed_days = DateTime.strptime("#{end_date}","%d/%m/%Y %H:%M:%S") diff = (st_days.to_date - ed_days.to_date).to_i if diff > 10 redirect_to (:back), :notice => "more then 10 days not hapenning" else ps = PoSale.where(:active_sale_id => a_sale_id, :event_name => @taxon_name, :st_date => @start_date, :ed_date => @end_date).last #where("active_sale_id =#{a_sale_id} and st_date like ? and ed_date like ?",hidesd.strftime("%Y-%m-%d %H:%M:%S"),hideed.strftime("%Y-%m-%d %H:%M:%S")).last #use find ps.update_attributes(:event_name => params[:active_sale]["taxon_name"], :st_date => DateTime.strptime("#{start_date}","%d/%m/%Y %H:%M:%S"), :ed_date => DateTime.strptime("#{end_date}","%d/%m/%Y %H:%M:%S")) end 

请帮助我!!!

Answer 1

redirect_to不会停止执行action方法，所以如果你调用它然后调用render或另一个redirect_to你将得到双重渲染exception。 有一个相当简单的修复，只是调用and return 。 例如

 redirect_to (:back), :notice => "problem with the start_date and end_date" and return 

请参阅Rails指南中的“避免双重渲染exception”。