引发 404 并继续 URL 链 [英] Raise 404 and continue the URL chain

问题描述

我有一个像这样的 URL 模式:

I've got a URLs pattern like this:

urlpatterns = (
    url(r'^$', list_titles, name='list'),
    url(r'^(?P<tag>[a-z-0-9]+?)/$', list_titles, name='filtered-list'),
    url(r'^(?P<title>S+?)/$', show_title, name='title'),
)

filtered-list 和 title 匹配相同的东西.

The filtered-list and title match the same things.

如果在 filtered-list 中有与 tag 匹配的可用列表，我希望 list_titles 触发.但是，如果没有匹配的 tag，我想将其返回给 URL 处理器，以便 show_title 触发.

If there is an available list of things matching the tag in filtered-list, I want list_titles to fire off. But if there isn't a matching tag, I want to bubble that back to the URL processor so show_title fires off.

如果没有匹配的标题，我会在那里提出适当的 404.

If there's no matching title, I'll raise a proper 404 there.

我知道我可以从视图内部执行此操作...但是必须将过程硬连接到视图中有点臭.我希望 URL 顺序决定首先选择什么以及它交给什么.

I know I can do this from inside the view...but it's a bit smelly having to hard-wire the process into the view. I'd like the URL order to decide what gets chosen first and what it hands off to.

推荐答案

这当然是视图逻辑；所有 urls.py 用于匹配 URL 模式，而不是执行验证.您可以使用 Http404 处理这个异常.

This is certainly view logic; all urls.py is for is for matching URL patterns, not performing validation. You can use the Http404 exception to handle this.

from django.http import Http404

def detail(request, poll_id):
    try:
        p = Poll.objects.get(pk=poll_id)
    except Poll.DoesNotExist:
        raise Http404
    return render_to_response('polls/detail.html', {'poll': p})

或者，您可以找到 <代码>get_object_or_404 或 get_list_or_404 方法，将其缩短一点.

Alternatively, you may find the get_object_or_404 or get_list_or_404 methods, which shorten it up a bit.

承诺的编辑如下.不完全是您要找的东西，但是...

Promised edit follows. Not exactly what you're looking for, but...

urlpatterns = (
    url(r'^$', list_titles, name='list'),
)

if 1=1: # Your logic here
    urlpatterns += ( url(r'^$', list_titles, name='list'), )

urlpatterns += (
    url(r'^(?P<title>S+?)/$', show_title, name='title'),
    url(r'^spam/$', spam_bar),
    url(r'^foo/$', foo_bar),
}

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