#31834: Cannot sqlmigrate on Django migrations that change unique_together
-------------------------------------+-------------------------------------
Reporter: Brіаn Lаі | Owner: nobody
Type: Bug | Status: new
Component: Database | Version: 3.0
layer (models, ORM) |
Severity: Normal | Keywords: sqlmigrate
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Somewhat similar to #26624, but forward sqlmigrate, reproduced on Django
3.0.8 and Postgres 10.x.
If a model with a unique_together of
{{{
unique_together = [
(a, b)
]
}}}
and then this becomes
{{{
unique_together = [
(a, b, c)
]
}}}
, although the makemigrations command successfully generates the
corresponding AlterUniqueTogether() operation, the operation cannot be
inspected with the sqlmigrate command.
Reproduce bug with the following (the project may also be attached)
{{{
class Model1(models.Model):
id = models.IntegerField(primary_key=True)
name = models.CharField(max_length=255, unique=True)
class Model2(models.Model):
id = models.IntegerField(primary_key=True)
link_id = models.CharField(max_length=255)
settings = models.ForeignKey(Model1, on_delete=models.CASCADE)
class Model3(models.Model):
id = models.IntegerField(primary_key=True)
order = models.IntegerField()
model_2 = models.ForeignKey(Model2, on_delete=models.CASCADE)
direct = models.BooleanField(default=True)
class Meta:
unique_together = [
('model_2', 'order')
# To get the bug, change this to ('model_2', 'order',
'direct') and sqlmigrate the migration that this creates.
]
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/31834>
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