Fixed #702 - Documented that ManyToMany fields can't be in unique_together; thanks poirier for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17314 bcc190cf-cafb-0310-a4f2-bffc1f526a37
2011-12-31 00:43:11 +00:00 · 2011-12-31 00:43:11 +00:00 · 060783d52d
parent 9fe578c212
commit 060783d52d
1 changed files with 6 additions and 0 deletions
--- a/docs/ref/models/options.txt
+++ b/docs/ref/models/options.txt
@ -247,6 +247,12 @@ Django quotes column and table names behind the scenes.

        unique_together = ("driver", "restaurant")

+    A :class:`~django.db.models.ManyToManyField` cannot be included in
+    unique_together (it's not even clear what that would mean). If you
+    need to validate uniqueness related to a
+    :class:`~django.db.models.ManyToManyField`, look at signals or
+    using an explicit :attr:`through <ManyToManyField.through>` model.
+
 ``verbose_name``
 ----------------