如何正确呈现自定义404和500页? [英] How to properly render custom 404 and 500 pages?

问题描述

是否有办法告诉Rails渲染您的自定义错误页面(例如，您在ErrorsController中编写的页面)?我搜索了很多主题，似乎很有效的一个主题是在您的ApplicationController中添加类似

Is there are way to tell Rails to render your custom error pages (for example, the ones you write in your ErrorsController)? I've searched many topics, and the one that seems to kinda work was to add to your ApplicationController something like

if Rails.env.production?
  rescue_from Exception, :with => :render_error
  rescue_from ActiveRecord::RecordNotFound, :with => :render_not_found
  rescue_from ActionController::UnknownController, :with => :render_not_found
  rescue_from ActionController::UnknownAction, :with => :render_not_found
end

，然后按照需要的方式编写方法render_error和render_not_found.在我看来，这似乎是一个非常简单的解决方案.而且，这很不好，因为您必须确切地知道所有可能发生的错误.这是一个临时解决方案.

and then you write your methods render_error and render_not_found the way you want. This seems to me like a really unelegant solution. Also, it's bad, because you have to know exactly what are all the errors that could happen. It's a temporary solution.

此外，实际上没有简单的方法可以通过这种方式来营救ActionController::RoutingError.我看到一种方法是添加类似的内容

Also, there is really no easy way to rescue an ActionController::RoutingError that way. I saw that one way was to add something like

get "*not_found", :to => "errors#not_found"

到routes.rb.但是，如果您想手动提高ActionController::RoutingError的位置怎么办?例如，如果不是管理员的人试图通过猜测URL转到管理"控制器.在那种情况下，与引发某种未经授权的访问"错误相比，我更喜欢提出404错误，因为这实际上会告诉该人他猜到了URL.如果您手动将其抬高，它将尝试呈现500页，而我需要404.

to your routes.rb. But what if you want to raise somewhere an ActionController::RoutingError manually? For example, if a person who is not an administrator tries to go to "adminy" controllers by guessing the URL. In those situations I prefer raising a 404 more than raising an "unauthorized access" error of some kind, because that would actually tell the person that he guessed the URL. If you raise it manually, it will try to render a 500 page, and I want a 404.

那么有没有办法告诉Rails:在所有情况下，您通常都会渲染404.html或500.html，渲染我的自定义404和500页"? (当然，我从public文件夹中删除了404.html和500.html页面.)

So is there a way to tell Rails: "In all cases you would normally render a 404.html or a 500.html, render my custom 404 and 500 pages"? (Of course, I deleted the 404.html and 500.html pages from the public folder.)

推荐答案

不幸的是，我所知道的任何方法都不能被覆盖以提供您想要的东西.您可以使用环绕滤镜.您的代码如下所示:

Unfortunately there aren't any methods I know of that can be overridden to provide what you want. You could use an around filter. Your code would look something like this:

class ApplicationController < ActionController::Base
  around_filter :catch_exceptions

  protected
    def catch_exceptions
      yield
    rescue => exception
      if exception.is_a?(ActiveRecord::RecordNotFound)
        render_page_not_found
      else
        render_error
      end
    end
end

您可以按照自己的意愿处理每种错误.然后，您的#render_page_not_found和#render_error方法必须类似于

You can handle each error as you see fit in that method. Then your #render_page_not_found and #render_error methods would have to be something like

render :template => 'errors/404'

然后，您需要在app/views/errors/404.html.[haml|erb]

这篇关于如何正确呈现自定义404和500页?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！