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[2.2.x] Refs #30547 -- Clarified that partial UniqueConstraints don't affect model validation. 

Backport of 230d75f59c from master
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Mariusz Felisiak 2019-07-18 12:56:25 +02:00
parent 4814db40c1
commit 0088e59292
1 changed files with 6 additions and 5 deletions
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11
docs/ref/models/constraints.txt
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@ -32,11 +32,12 @@ option.
In general constraints are **not** checked during ``full_clean()``, and do
not raise ``ValidationError``\s. Rather you'll get a database integrity
error on ``save()``. ``UniqueConstraint``\s are different in this regard,
in that they leverage the existing ``validate_unique()`` logic, and thus
enable two-stage validation. In addition to ``IntegrityError`` on
``save()``, ``ValidationError`` is also raised during model validation when
the ``UniqueConstraint`` is violated.
error on ``save()``. ``UniqueConstraint``\s without a
:attr:`~UniqueConstraint.condition` (i.e. non-partial unique constraints)
are different in this regard, in that they leverage the existing
``validate_unique()`` logic, and thus enable two-stage validation. In
addition to ``IntegrityError`` on ``save()``, ``ValidationError`` is also
raised during model validation when the ``UniqueConstraint`` is violated.
``CheckConstraint``
===================