Merge branch 'master' of github.com:benjaoming/django-wiki

wiki/models/article.py

@@ -57,7 +57,7 @@ class Article(models.Model):
         if user == self.owner:
             return True
         if self.group_read:
-            if self.group and user.groups.filter(id=self.group.id):
+            if self.group and user.groups.filter(id=self.group.id).exists():
                 return True
         if self.can_moderate(user):
             return True
@@ -74,7 +74,7 @@ class Article(models.Model):
         if user == self.owner:
             return True
         if self.group_write:
-            if self.group and user and user.groups.filter(id=self.group.id):
+            if self.group and user and user.groups.filter(id=self.group.id).exists():
                 return True
         if self.can_moderate(user):
             return True

wiki/models/urlpath.py

@@ -60,6 +60,8 @@ class URLPath(MPTTModel):
         If the cached ancestors were not set explicitly, they will be retrieved from
         the database.
         """
+        if not self.get_ancestors().exists():
+            self._cached_ancestors = []
         if not hasattr(self, "_cached_ancestors"):
             self._cached_ancestors = list(self.get_ancestors().select_related_common() )