#30292: The unique_together meta option does not get migrated
-------------------------------------+-------------------------------------
Reporter: Calin | Owner: nobody
Bule |
Type: Bug | Status: new
Component: | Version: 2.1
Migrations | Keywords: migrations, unique-
Severity: Normal | together, constraint
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
I am developing an application in Django 2.1.7 + PostgreSQL, on a Windows
10 machine. I'm trying to create a unique constraint of a composed key
using the unique_together option in the Meta class of a model, but it
won't migrate, nor does Django return an error message.
I went directly into the database engine and created the constraint
manually with and it works well both in the db and Django admin.
Django model code:
{{{
class PersonRelationship(db_table):
person_1 = models.ForeignKey(AccountPerson, on_delete=models.CASCADE,
related_name="person_1", null=False)
person_2 = models.ForeignKey(AccountPerson, on_delete=models.CASCADE,
related_name="person_2", null=False)
relationship_type = models.ForeignKey(PersonRelationshipType,
on_delete=models.CASCADE, null=False)
def __str__(self):
return str(self.person_1) + " - " + str(self.person_2) + " " +
str(self.relationship_type)
class Meta:
options.unique_togehter = (("person_1", "person_2",),)
}}}
SQL code used to manually create the constraint:
{{{
ALTER TABLE public.accounts_personrelationship
ADD CONSTRAINT accounts_personrelationship_un
UNIQUE (person_1_id,person_2_id,relationship_type_id);
}}}
After generating the migration file, I manually inserted the code for the
generation of the constraint:
{{{
migrations.AlterUniqueTogether(
name='personaccountsrelationship',
unique_together={('account_1', 'account_2')},
),
}}}
I then ran the migrate command and checked the db and the constraint was
created. I then made other modifications and ran makemigrations again and,
among other stuff I found this:
{{{
class Migration(migrations.Migration):
dependencies = [
('accounts', '0001_initial'),
]
operations = [
migrations.AlterUniqueTogether(
name='personrelationship',
unique_together=set(),
),
]
}}}
It deleted the constraint I previously created manually.
So, not only the constraints do not get created automatically, but they
get deleted when I run further migrations.
I tried running the migration on a MacOS X Mojave and it works well. On
Windows though, I can't seem to get it to work.
--
Ticket URL: <https://code.djangoproject.com/ticket/30292>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
--
You received this message because you are subscribed to the Google Groups
"Django updates" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-updates/052.b744bb5be797351e80f5b9177cc80fd4%40djangoproject.com.
For more options, visit https://groups.google.com/d/optout.
