当referrer不可用时，正确地执行redirect_to：返回Ruby on Rails

问题描述

我遇到了 redirect_to：back 的问题。是的，它是推荐人。

我经常得到异常

我发现这是推荐人无法使用的结果。有没有办法，例如，可以在访问的最后一页访问每次访问时设置会话变量，并且，当HTTP_REFERER不可用时，利用此会话变量重定向到？

解决方案

没有设置推荐人的情况并不常见，我通常会拯救这种期望：

  def some_method 
 redirect_to：back 
 rescue ActionController :: RedirectBackError 
 redirect_to root_path 
 end 
  

如果你经常这样做（我认为这是一个坏主意）你可以用Maran建议的其他方法包装它。

BTW我认为这是一个坏主意，因为这会使用户流模糊不清。只有在登录的情况下这才是明智的。

更新：有几个人指出这个不再有效。
相反，使用 redirect_back ，这种方法也支持回退。然后代码成为：

  def some_method 
 redirect_back fallback_location：root_path 
 end 
  

I'm having a problem with redirect_to :back. Yes, it's referrers.

I often get the exception

I realize that this is a result of a referrer not being available. Is there a way that, for example, one can set a session variable on each access with the last page visited, and, when HTTP_REFERER is not available, utilize this session variable to redirect to?

解决方案

It is unlikely that you do have a session and don't have a referrer.

The situation that a referrer is not set isn't that uncommon and I usually rescue that expection:

def some_method
  redirect_to :back
rescue ActionController::RedirectBackError
  redirect_to root_path
end

If you do this often (which I think is a bad idea) you can wrap it in an other method like Maran suggests.

BTW I think that's a bad idea because this makes the userflow ambiguous. Only in the case of a login this is sensible.

UPDATE: As several people pointed out this no longer works with Rails 5.Instead, use redirect_back, this method also supports a fallback. The code then becomes:

def some_method
  redirect_back fallback_location: root_path
end

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