python 如何将 django.core.urlresolvers.reverse 与函数引用而不是命名 URL 模式一起使用？
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How do I use django.core.urlresolvers.reverse with a function reference instead of a named URL pattern?
提问by Paul D. Waite
In my urls.pyfile, I have:
在我的urls.py文件中，我有：
from myapp import views
...
(r'^categories/$', views.categories)
Where categoriesis a view function inside myapp/views.py. No other URLconf lines reference views.categories.
categories里面的视图函数在哪里myapp/views.py。没有其他 URLconf 行参考views.categories。
In a unit test file, I'm trying to grab this URL using django.core.urlresolvers.reverse(), instead of just copying '/categories/' (DRY and all that). So, I have:
在单元测试文件中，我试图使用 获取这个 URL django.core.urlresolvers.reverse()，而不是仅仅复制 '/categories/'（DRY 和所有这些）。所以我有：
from django.core.urlresolvers import reverse
from myapp import views
...
url = reverse(views.categories)
When I run my tests, I get a NoReverseMatcherror:
当我运行我的测试时，我收到一个NoReverseMatch错误：
NoReverseMatch: Reverse for '<function categories at 0x1082f30>' with arguments '()' and keyword arguments '{}' not found.
It matches just fine if I make the URL pattern a named pattern, like this:
如果我将 URL 模式设为命名模式，它就会很好地匹配，如下所示：
url(r'^categories/$', views.categories, 'myapp-categories')
And use the pattern name to match it:
并使用模式名称来匹配它：
url = reverse('myapp-categories')
But as far as I can tell from the reversedocumentation, I shouldn't need to make it a named URL pattern just to use reverse.
但据我可以从告诉的reverse文档，我不应该需要使它一个名为URL模式只是为了利用reverse。
Any ideas what I'm doing wrong?
任何想法我做错了什么？
采纳答案by Paul D. Waite
After futher investigation, turns out it was an issue with how I was importing the views module:
经过进一步调查，事实证明这是我如何导入视图模块的问题：
How do I successfully pass a function reference to Django's reverse() function?
如何成功地将函数引用传递给 Django 的 reverse() 函数？
Thanks for the help though, guys: you inspired me to look at it properly.
感谢您的帮助，伙计们：您激励我正确看待它。
回答by camflan
Hyman M.'s example is nearly correct.
Hyman M. 的例子几乎是正确的。
It needs to be a url function, not a tuple, if you want to use named urls.
如果你想使用命名的 url，它需要是一个 url 函数，而不是一个元组。
url(r'^no_monkeys/$', 'views.noMonkeys', {}, "no-monkeys"),
回答by Carl Meyer
This does work, and all the code that you've pasted is correct and works fine (I just copied it into a clean test/project app and it reversed the URL without any problem). So there's something else going on here that you haven't showed us. Simplify down to the bare-bones basics until it works, then start adding complexity back in and see where it's breaking.
这确实有效，并且您粘贴的所有代码都是正确的并且可以正常工作（我只是将其复制到一个干净的测试/项目应用程序中，并且它反转了 URL，没有任何问题）。所以这里还有一些你没有向我们展示的东西。简化到最基本的基础，直到它工作，然后开始增加复杂性，看看它在哪里中断。
Also, you can do "./manage.py shell" and then interactively import the reverse function and your view function and try the reverse. That'll remove the test setup as a possible cause.
此外，您可以执行“./manage.py shell”，然后以交互方式导入反向函数和视图函数并尝试反向。这将删除测试设置作为可能的原因。
回答by Hyman M.
The reverse function actually uses the "name" of the URL. This is defined like so:
reverse 函数实际上使用了 URL 的“名称”。这是这样定义的：
urlpatterns = patterns('',
(r'^no_monkeys/$', 'views.noMonkeys', {}, "no-monkeys"),
(r'^admin/(.*)', admin.site.root),
)
Now you would call reverse with the string "no-monkeys" to get the correct url.
现在，您将使用字符串“no-monkeys”调用 reverse 以获取正确的 url。
Ninja Edit: Here is a linkto the django docs on the subject.
