#31317: Migration using CreateModel with unique_together followed by
AlterUniqueTogether crashes
-------------------------------------+-------------------------------------
Reporter: Adam (Chainz) | Owner: nobody
Johnson |
Type: Bug | Status: new
Component: Migrations | Version: master
Severity: Normal | Resolution:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Adam (Chainz) Johnson):
2.2, 3.0, master
It isn't squashed in this case because the `unique_together` includes a
FK.
https://github.com/adamchainz/django-unique-together-
bug/blob/master/testproj/testapp/migrations/0001_squashed_0002_add_author.py
{{{#!python
# Generated by Django 2.1.15 on 2020-02-28 06:56
from django.db import migrations, models
import django.db.models.deletion
class Migration(migrations.Migration):
replaces = [("testapp", "0001_initial"), ("testapp",
"0002_add_author")]
initial = True
dependencies = []
operations = [
migrations.CreateModel(
name="Book",
fields=[
(
"id",
models.AutoField(
auto_created=True,
primary_key=True,
serialize=False,
verbose_name="ID",
),
),
("title", models.CharField(default="", max_length=100)),
],
options={"unique_together": {("title",)},},
),
migrations.CreateModel(
name="Author",
fields=[
(
"id",
models.AutoField(
auto_created=True,
primary_key=True,
serialize=False,
verbose_name="ID",
),
),
],
),
migrations.AddField(
model_name="book",
name="author",
field=models.ForeignKey(
null=True,
on_delete=django.db.models.deletion.DO_NOTHING,
to="testapp.Author",
),
),
migrations.AlterUniqueTogether(
name="book", unique_together={("title", "author")},
),
]
}}}
It's also possible to hand write such a migration.
--
Ticket URL: <https://code.djangoproject.com/ticket/31317#comment:2>
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