queryset-refactor: Made none() a method on Querysets, as the documentation

indicates (it was only added to managers in [4394]. Refs #6177.


git-svn-id: http://code.djangoproject.com/svn/django/branches/queryset-refactor@7232 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/query.py

@@ -293,6 +293,12 @@ class _QuerySet(object):
         return self._clone(klass=DateQuerySet, setup=True, _field=field,
                 _kind=kind, _order=order)
 
+    def none(self):
+        """
+        Returns an empty queryset.
+        """
+        return self._clone(klass=EmptyQuerySet)
+
     ##################################################################
     # PUBLIC METHODS THAT ALTER ATTRIBUTES AND RETURN A NEW QUERYSET #
     ##################################################################

tests/modeltests/lookup/models.py

@@ -254,6 +254,8 @@ DoesNotExist: Article matching query does not exist.
 []
 >>> Article.objects.none().filter(headline__startswith='Article')
 []
+>>> Article.objects.filter(headline__startswith='Article').none()
+[]
 >>> Article.objects.none().count()
 0
 >>> [article for article in Article.objects.none().iterator()]