Anonymous avatar Anonymous committed 426d1c3

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

Backport of r17314 from trunk.

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docs/ref/models/options.txt

 
         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``
 ----------------
 
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