Made clear() on a reverse foreign key significantly more efficient. Thanks to Andrew Godwin for the review.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16335 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 1 insertions, 3 deletions

diff --git a/django/db/models/fields/related.py b/django/db/models/fields/related.py
index ffa5692646..cedf3088c4 100644
--- a/django/db/models/fields/related.py
+++ b/django/db/models/fields/related.py
@@ -459,9 +459,7 @@ class ForeignRelatedObjectsDescriptor(object):
                 remove.alters_data = True
 
                 def clear(self):
-                    for obj in self.all():
-                        setattr(obj, rel_field.name, None)
-                        obj.save()
+                    self.update(**{rel_field.name: None})
                 clear.alters_data = True
 
         manager = RelatedManager()