#32703: Deferred UniqueConstraints should not be validated in validate_unique()
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Reporter: Manuel Baclet | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 3.1
(models, ORM) |
Severity: Normal | Resolution:
Keywords: UniqueConstraint | Triage Stage:
deferrable | Unreviewed
Has patch: 0 | Needs documentation: 1
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 1 | UI/UX: 0
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Description changed by Manuel Baclet:
Old description:
> When using a deferred UniqueConstraint, we are expecting validation not
> to occur before transaction commit.
> Considering a model with a field `unique_valued_field` with a deferred
> UniqueConstraint and two models `m1` and `m2`, we should be able to do:
> {{{#!python
> with transaction.atomic():
> saved_value = m1.unique_valued_field
> m1.unique_valued_field = m2.unique_valued_field
> m2.unique_valued_field = saved_value
> m1.save()
> m2.save()
> }}}
> Currently, this raises a `ValidationError`.
New description:
When using a deferred UniqueConstraint, we are expecting validation not to
occur before transaction commit.
Considering a model with a field `unique_valued_field` with a deferred
UniqueConstraint and two instances `m1` and `m2`, we should be able to do:
{{{#!python
with transaction.atomic():
saved_value = m1.unique_valued_field
m1.unique_valued_field = m2.unique_valued_field
m2.unique_valued_field = saved_value
m1.save()
m2.save()
}}}
Currently, this raises a `ValidationError`.
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Ticket URL: <https://code.djangoproject.com/ticket/32703#comment:3>
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