问题描述
我想在Rails中伪造一个404页面。在PHP中，我只会发送带有错误代码的标头：
I'd like to 'fake' a 404 page in Rails. In PHP, I would just send a header with the error code as such:
header("HTTP/1.0 404 Not Found");
如何用Rails完成？
How is that done with Rails?
推荐答案
不要自己渲染404，没有理由; Rails已经内置了这个功能。如果要显示404页面，请在<$中创建一个 render_404 方法（或者我调用的 not_found ） c $ c> ApplicationController 像这样：
Don't render 404 yourself, there's no reason to; Rails has this functionality built in already. If you want to show a 404 page, create a render_404 method (or not_found as I called it) in ApplicationController like this:
def not_found
raise ActionController::RoutingError.new('Not Found')
end
Rails还处理 AbstractController :: ActionNotFound 和 ActiveRecord :: RecordNotFound 以同样的方式。
Rails also handles AbstractController::ActionNotFound, and ActiveRecord::RecordNotFound the same way.
这样可以做得更好：
1）它使用Rails内置的 rescue_from 处理程序来渲染404页面，和
2）它会中断你的代码的执行，让你做一些好的事情，比如：
1) It uses Rails' built in rescue_from handler to render the 404 page, and2) it interrupts the execution of your code, letting you do nice things like:
user = User.find_by_email(params[:email]) or not_found
user.do_something!
，无需编写丑陋的条件语句。
without having to write ugly conditional statements.
作为奖励，它在测试中也非常容易处理。例如，在rspec集成测试中：
As a bonus, it's also super easy to handle in tests. For example, in an rspec integration test:
# RSpec 1
lambda {
visit '/something/you/want/to/404'
}.should raise_error(ActionController::RoutingError)
# RSpec 2+
expect {
get '/something/you/want/to/404'
}.to raise_error(ActionController::RoutingError)
和minitest：
assert_raises(ActionController::RoutingError) do
get '/something/you/want/to/404'
end
这篇关于如何在Rails中重定向到404？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！