[2.0.x] Fixed #29296 -- Fixed crashes in admindocs when a view is a callable object.

Backport of 33a0b7ac815588ed92dca215e153390af8bdbdda from master

3 files changed, 12 insertions, 7 deletions

diff --git a/django/contrib/admindocs/middleware.py b/django/contrib/admindocs/middleware.py
index b5024de72c..4da5604106 100644
--- a/django/contrib/admindocs/middleware.py
+++ b/django/contrib/admindocs/middleware.py
@@ -2,6 +2,8 @@ from django.conf import settings
 from django.http import HttpResponse
 from django.utils.deprecation import MiddlewareMixin
 
+from .utils import get_view_name
+
 
 class XViewMiddleware(MiddlewareMixin):
     """
@@ -24,5 +26,5 @@ class XViewMiddleware(MiddlewareMixin):
         if request.method == 'HEAD' and (request.META.get('REMOTE_ADDR') in settings.INTERNAL_IPS or
                                          (request.user.is_active and request.user.is_staff)):
             response = HttpResponse()
-            response['X-View'] = "%s.%s" % (view_func.__module__, view_func.__name__)
+            response['X-View'] = get_view_name(view_func)
             return response
diff --git a/django/contrib/admindocs/utils.py b/django/contrib/admindocs/utils.py
index b6a23c8849..992c62d2bd 100644
--- a/django/contrib/admindocs/utils.py
+++ b/django/contrib/admindocs/utils.py
@@ -18,6 +18,12 @@ else:
     docutils_is_available = True
 
 
+def get_view_name(view_func):
+    mod_name = view_func.__module__
+    view_name = getattr(view_func, '__qualname__', view_func.__class__.__name__)
+    return mod_name + '.' + view_name
+
+
 def trim_docstring(docstring):
     """
     Uniformly trim leading/trailing whitespace from docstrings.
diff --git a/django/contrib/admindocs/views.py b/django/contrib/admindocs/views.py
index e45898c025..c4b9ec6917 100644
--- a/django/contrib/admindocs/views.py
+++ b/django/contrib/admindocs/views.py
@@ -23,6 +23,8 @@ from django.utils.inspect import (
 from django.utils.translation import gettext as _
 from django.views.generic import TemplateView
 
+from .utils import get_view_name
+
 # Exclude methods starting with these strings from documentation
 MODEL_METHODS_EXCLUDE = ('_', 'add_', 'delete', 'save', 'set_')
 
@@ -128,18 +130,13 @@ class TemplateFilterIndexView(BaseAdminDocsView):
 class ViewIndexView(BaseAdminDocsView):
     template_name = 'admin_doc/view_index.html'
 
-    @staticmethod
-    def _get_full_name(func):
-        mod_name = func.__module__
-        return '%s.%s' % (mod_name, func.__qualname__)
-
     def get_context_data(self, **kwargs):
         views = []
         urlconf = import_module(settings.ROOT_URLCONF)
         view_functions = extract_views_from_urlpatterns(urlconf.urlpatterns)
         for (func, regex, namespace, name) in view_functions:
             views.append({
-                'full_name': self._get_full_name(func),
+                'full_name': get_view_name(func),
                 'url': simplify_regex(regex),
                 'url_name': ':'.join((namespace or []) + (name and [name] or [])),
                 'namespace': ':'.join((namespace or [])),