From: Preston Timmons <prestontimmons@gfa.org>
Origin: https://github.com/django/django/pull/2601/
Last-Updated: 2014-06-22
Subject: Fixed #22486: Reverse raises AttributeError on partial functions.

Create the lookup_str from the original function whenever a partial
is provided as an argument to a url pattern.
---
 django/core/urlresolvers.py        |  4 ++++
 tests/urlpatterns_reverse/urls.py  |  6 +++++-
 tests/urlpatterns_reverse/views.py | 10 ++++++++++
 3 files changed, 19 insertions(+), 1 deletion(-)

--- a/django/core/urlresolvers.py
+++ b/django/core/urlresolvers.py
@@ -8,6 +8,7 @@
 """
 
 import re
+import functools
 from threading import local
 
 from django.http import Http404
@@ -248,6 +249,9 @@
                 self._callback_strs.add(pattern._callback_str)
             elif hasattr(pattern, '_callback'):
                 callback = pattern._callback
+                if isinstance(callback, functools.partial):
+                    callback = callback.func
+
                 if not hasattr(callback, '__name__'):
                     lookup_str = callback.__module__ + "." + callback.__class__.__name__
                 else:
--- a/tests/regressiontests/urlpatterns_reverse/urls.py
+++ b/tests/regressiontests/urlpatterns_reverse/urls.py
@@ -2,7 +2,7 @@
 
 from django.conf.urls import patterns, url, include
 
-from .views import empty_view, absolute_kwargs_view
+from .views import empty_view, empty_view_partial, empty_view_wrapped, absolute_kwargs_view
 
 
 other_patterns = patterns('',
@@ -53,6 +53,10 @@
             include('regressiontests.urlpatterns_reverse.included_urls')),
     url('', include('regressiontests.urlpatterns_reverse.extra_urls')),
 
+    # Partials should be fine.
+    url(r'^partial/', empty_view_partial, name="partial"),
+    url(r'^partial_wrapped/', empty_view_wrapped, name="partial_wrapped"),
+
     # This is non-reversible, but we shouldn't blow up when parsing it.
     url(r'^(?:foo|bar)(\w+)/$', empty_view, name="disjunction"),
 
--- a/tests/regressiontests/urlpatterns_reverse/views.py
+++ b/tests/regressiontests/urlpatterns_reverse/views.py
@@ -1,3 +1,5 @@
+from functools import partial, update_wrapper
+
 from django.http import HttpResponse
 from django.views.generic import RedirectView
 from django.core.urlresolvers import reverse_lazy
@@ -40,3 +42,11 @@
 
 def bad_view(request, *args, **kwargs):
     raise ValueError("I don't think I'm getting good value for this view")
+
+
+empty_view_partial = partial(empty_view, template_name="template.html")
+
+
+empty_view_wrapped = update_wrapper(
+    partial(empty_view, template_name="template.html"), empty_view,
+)