#22833: 1.7 migrations can't delete codependent "through" models
---------------------------------+--------------------------------------
Reporter: mozumder@… | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: 1.7-beta-2
Severity: Release blocker | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Changes (by bmispelon):
* needs_better_patch: => 0
* stage: Unreviewed => Accepted
* severity: Normal => Release blocker
* needs_tests: => 0
* needs_docs: => 0
Comment:
Hi,
I can indeed reproduce your issue with the following simplified models
(the problem appears on `master` as well):
{{{#!python
from django.db import models
class Foo(models.Model):
bazes = models.ManyToManyField('Baz', through='Bar')
class Bar(models.Model):
foo = models.ForeignKey('Foo')
baz = models.ForeignKey('Baz')
class Baz(models.Model):
pass
}}}
After running an initial `makemigrations && migrate`, I delete the first
two models, then run `makemigrations` (which works, producing essentially
the same migration as the one you describe). After that, running `migrate`
triggers a `KeyError` like the one you reported.
I'll bump the severity to `release blocker` since this use-case should be
perfectly valid.
Thanks.
--
Ticket URL: <https://code.djangoproject.com/ticket/22833#comment:1>
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