Django-debug-toolbar: DjDT 在 urls.py 中加载模型之前反转 url

最初，我在尝试使用 Django 调试工具栏和 uwsgi 设置新项目时遇到此错误：

NoReverseMatch at /

u'djdt' is not a registered namespace

这首先发生在 uwsgi 中，它不会预先加载模型。 后来，能够通过使用以下修补 django runserver 来重现它：

diff --git a/django/core/management/commands/runserver.py b/django/core/management/commands/runserver.py
index 391e0b4..02dadc7 100644
--- a/django/core/management/commands/runserver.py
+++ b/django/core/management/commands/runserver.py
@@ -89,7 +89,7 @@ class Command(BaseCommand):
         quit_command = (sys.platform == 'win32') and 'CTRL-BREAK' or 'CONTROL-C'

         self.stdout.write("Validating models...\n\n")
-        self.validate(display_num_errors=True)
+        #self.validate(display_num_errors=True)
         self.stdout.write((
             "%(started_at)s\n"
             "Django version %(version)s, using settings %(settings)r\n"

我在models.py中的url补丁之前放了一个pdb，得到了这个：

/usr/lib64/python2.7/threading.py(784)__bootstrap()
-> self.__bootstrap_inner()
  /usr/lib64/python2.7/threading.py(811)__bootstrap_inner()
-> self.run()
  /usr/lib64/python2.7/threading.py(764)run()
-> self.__target(*self.__args, *self.__kwargs)
  /usr/lib64/python2.7/SocketServer.py(593)process_request_thread()
-> self.finish_request(request, client_address)
  /usr/lib64/python2.7/SocketServer.py(334)finish_request()
-> self.RequestHandlerClass(request, client_address, self)
  django/core/servers/basehttp.py(150)__init__()
-> super(WSGIRequestHandler, self).__init__(*args, **kwargs)
  /usr/lib64/python2.7/SocketServer.py(649)__init__()
-> self.handle()
  /usr/lib64/python2.7/wsgiref/simple_server.py(124)handle()
-> handler.run(self.server.get_app())
  /usr/lib64/python2.7/wsgiref/handlers.py(85)run()
-> self.result = application(self.environ, self.start_response)
  django/contrib/staticfiles/handlers.py(72)__call__()
-> return self.application(environ, start_response)
  django/core/handlers/wsgi.py(255)__call__()
-> response = self.get_response(request)
  django/core/handlers/base.py(103)get_response()
-> resolver_match = resolver.resolve(request.path_info)
  django/core/urlresolvers.py(319)resolve()
-> for pattern in self.url_patterns:
  django/core/urlresolvers.py(347)url_patterns()
-> patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
  django/core/urlresolvers.py(342)urlconf_module()
-> self._urlconf_module = import_module(self.urlconf_name)
  django/utils/importlib.py(35)import_module()
-> __import__(name)
  project/urls.py(5)<module>()
-> admin.autodiscover()
  mezzanine/boot/__init__.py(76)autodiscover()
-> django_autodiscover(*args, **kwargs)
  django/contrib/admin/__init__.py(29)autodiscover()
-> import_module('%s.admin' % app)
  django/utils/importlib.py(35)import_module()
-> __import__(name)
  django/contrib/auth/admin.py(179)<module>()
-> admin.site.register(Group, GroupAdmin)
  mezzanine/boot/lazy_admin.py(22)register()
-> super(LazyAdminSite, self).register(*args, **kwargs)
  django/contrib/admin/sites.py(98)register()
-> validate(admin_class, model)
  django/contrib/admin/validation.py(22)validate()
-> models.get_apps()
  django/db/models/loading.py(134)get_apps()
-> self._populate()
  django/db/models/loading.py(72)_populate()
-> self.load_app(app_name, True)
  django/db/models/loading.py(96)load_app()
-> models = import_module('.models', app_name)
  django/utils/importlib.py(35)import_module()
-> __import__(name)
  debug_toolbar/models.py(63)<module>()
-> patch_root_urlconf()
> debug_toolbar/models.py(51)patch_root_urlconf()
-> reverse('djdt:render_panel')
(Pdb) reverse('djdt:render_panel')
** ImproperlyConfigured: The included urlconf project.urls doesn't have any patterns in it

似乎 admin.autodiscover() 在 urls.py 中加载模型，随后强制 debug_toolbar.models 反转 url，尽管 urls.py 中还没有任何 url。