如何成功将函数引用传递给Django的reverse()函数？

我有一个全新的Django项目.我添加了一个最小视图函数views.py和一个URL模式urls.py,通过函数引用而不是字符串传递视图:

# urls.py
# -------

# coding=utf-8

from django.conf.urls.defaults import *

from myapp import views


urlpatterns = patterns('',
    url(r'^myview/$', views.myview),
)


# views.py
----------

# coding=utf-8

from django.http import HttpResponse


def myview(request):
    return HttpResponse('MYVIEW LOL',  content_type="text/plain")

我试图reverse()通过传递一个函数引用来获取URL.但我没有得到匹配,尽管我确认我传递给反向的视图函数与我在URL模式中放置的完全相同的视图函数:

>>> from django.core.urlresolvers import reverse
>>> import urls
>>> from myapp import views

>>> urls.urlpatterns[0].callback is views.myview
True

>>> reverse(views.myview)
Traceback (most recent call last):
  File "", line 1, in 
  File "/Library/Python/2.5/site-packages/django/core/urlresolvers.py", line 254, in reverse
    *args, **kwargs)))
  File "/Library/Python/2.5/site-packages/django/core/urlresolvers.py", line 243, in reverse
    "arguments '%s' not found." % (lookup_view, args, kwargs))
NoReverseMatch: Reverse for '' with arguments '()' and keyword arguments '{}' not found.

据我所知,文档中的函数引用应该在URL模式和reverse().

带有函数引用的URL模式

reverse 带功能参考

我正在使用Django主干,修订版9092.

得到它了!!问题是一些进口是myproject.myapp.views,而有些只是myapp.views.这足以让Python模块系统感到困惑,以至于它不再将这些函数检测为同一个对象.这是因为你的主要settings.py可能有一条线:

ROOT_URLCONF = `myproject.urls`

要解决此问题,请尝试在shell会话中使用完全导入:

>>> from django.core.urlresolvers import reverse
>>> from myproject.myapp import views
>>> reverse(views.myview)
'/myview/'

这是调试会话的日志,适用于任何感兴趣的未来读者:

>>> from django.core import urlresolvers
>>> from myapp import myview
>>> urlresolvers.get_resolver (None).reverse_dict
{None: ([(u'myview/', [])], 'myview/$'), : ([(u'myview/', [])], 'myview/$')}
>>> v1 = urlresolvers.get_resolver (None).reverse_dict.items ()[1][0]
>>> reverse(v1)
'/myview/'
>>> v1 is myview
False
>>> v1.__module__
'testproject.myapp.views'
>>> myview.__module__
'myapp.views'

如果您更改URL匹配会发生r'^myview/$'什么？

你有没有尝试过视图名称？有点像reverse ('myapp.myview')？

是urls.py根URLconf,还是在myapp应用程序中？需要有从根到视图的完整路径才能解析它.如果那样myproject/myapp/urls.py,那么myproject/urls.py你需要这样的代码:

from django.conf.urls.defaults import patterns
urlpatterns = patterns ('',
    (r'^/', 'myapp.urls'),
)