#32635: Creating a UniqueConstraint with condition referencing OneToOneField
generates invalid SQL
-------------------------------------+-------------------------------------
Reporter: sim1234 | Owner: nobody
Type: | Status: new
Uncategorized |
Component: | Version: 2.2
Uncategorized | Keywords: UniqueConstraint
Severity: Normal | OneToOneField
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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== Creating a UniqueConstraint with condition referencing OneToOneField
generates invalid SQL
Example:
{{{
# models.py
from django.db import models
class Model1(models.Model):
name = models.CharField(max_length=255)
class Meta:
constraints = (
models.UniqueConstraint(
name="unique_onetoone",
fields=("name", ),
condition=models.Q(model__isnull=True),
),
)
class Model2(models.Model):
name = models.CharField(max_length=255)
model = models.OneToOneField(
Model1, related_name="model", on_delete=models.CASCADE
)
# generated migrations/0001_initial.py
import django.db.models.deletion
from django.db import migrations, models
class Migration(migrations.Migration):
dependencies = []
operations = [
// ... CreateModel, etc ...
migrations.AddConstraint(
model_name="model1",
constraint=models.UniqueConstraint(
name="unique_onetoone",
fields=("name", ),
condition=models.Q(model__isnull=True),
),
),
]
}}}
Running ''manage.py sqlmigrate test 0001'' generates this SQL for creating
the unique index and the WHERE clause is completly wrong.
{{{
-- ... CREATE TABLE, etc ...
CREATE UNIQUE INDEX "unique_onetoone" ON "test_model1" ("name", ) WHERE
"id" IS NULL;
}}}
Expected behaviour is receiving ''FieldError("Joined field references are
not permitted in this query")''. This behaviour is observed when using
''condition=models.Q(model__id__isnull=True)''.
--
Ticket URL: <https://code.djangoproject.com/ticket/32635>
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