Fixed #23601 -- Ensured view exists in URLconf before importing it in admindocs.

1 files changed, 6 insertions, 1 deletions

diff --git a/django/core/urlresolvers.py b/django/core/urlresolvers.py
index 6cd612e208..eff7e078e4 100644
--- a/django/core/urlresolvers.py
+++ b/django/core/urlresolvers.py
@@ -353,6 +353,11 @@ class RegexURLResolver(LocaleRegexProvider):
             self._populate()
         return self._app_dict[language_code]
 
+    def _is_callback(self, name):
+        if not self._populated:
+            self._populate()
+        return name in self._callback_strs
+
     def resolve(self, path):
         path = force_text(path)  # path may be a reverse_lazy object
         tried = []
@@ -430,7 +435,7 @@ class RegexURLResolver(LocaleRegexProvider):
 
         original_lookup = lookup_view
         try:
-            if lookup_view in self._callback_strs:
+            if self._is_callback(lookup_view):
                 lookup_view = get_callable(lookup_view, True)
         except (ImportError, AttributeError) as e:
             raise NoReverseMatch("Error importing '%s': %s." % (lookup_view, e))