Opened 10 years ago

Last modified 5 weeks ago

#23521 assigned Bug

removal of concrete Model from bases doesn't remove it from ModelState bases — at Initial Version

Reported by: Sergey Fedoseev Owned by:
Component: Migrations Version: dev
Severity: Normal Keywords:
Cc: info+coding@…, bugs@…, ericmills2@…, Charlie Denton, Ian Foote, Daniel Rios, Sardorbek Imomaliev Triage Stage: Accepted
Has patch: yes Needs documentation: no
Needs tests: no Patch needs improvement: yes
Easy pickings: no UI/UX: no

Description

Steps to reproduce:

  • add test app with models.py: 
    class Thing(models.Model):
    pass


class SuperThing(Thing):
    pass
  • do 
manage.py makemigrations test
  • change models.py: 
    class SuperThing(models.Model):
    thing_ptr = models.AutoField(primary_key=True)
  • do 
manage.py makemigrations test
  • do it one more time 
manage.py makemigrations test

last command results in

django.db.migrations.state.InvalidBasesError: Cannot resolve bases for [<ModelState: 'test.SuperThing'>]
This can happen if you are inheriting models from an app with migrations (e.g. contrib.auth)
 in an app with no migrations; see https://docs.djangoproject.com/en/1.7/topics/migrations/#dependencies for more

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