#35424: Migration autodetector fails when order_with_respect_to is removed, but
an
_order field remains
------------------------------------+------------------------------------
Reporter: Stuart Attenborrow | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: 4.2
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 1 | UI/UX: 0
------------------------------------+------------------------------------
Changes (by Sarah Boyce):
* stage: Unreviewed => Accepted
Comment:
Thank you for the report, managed to replicate on main
Given an existing migrated model
{{{#!python
class Foo(models.Model):
order = models.IntegerField(default=999999)
class Meta:
order_with_respect_to = "order"
}}}
when you change that model to
{{{#!python
class Foo(models.Model):
_order = models.IntegerField(default=999999)
class Meta:
ordering = ("_order",)
}}}
that generates a migration like
{{{#!python
# Generated by Django 5.1 on 2024-05-03 12:02
from django.db import migrations
class Migration(migrations.Migration):
dependencies = [
('app3', '0004_foo'),
]
operations = [
migrations.AlterModelOptions(
name='foo',
options={'ordering': ('_order',)},
),
migrations.RenameField(
model_name='foo',
old_name='order',
new_name='_order',
),
migrations.AlterOrderWithRespectTo(
name='foo',
order_with_respect_to=None,
),
]
}}}
Which fails with `django.core.exceptions.FieldDoesNotExist: Foo has no
field named 'order'`
If you move `AlterOrderWithRespectTo` to be the first operation, this
migration can be applied.
--
Ticket URL: <https://code.djangoproject.com/ticket/35424#comment:1>
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