id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
28243	Renaming Base model in multi-table inheritance raises django.core.exceptions.FieldError: Auto-generated field clashes	Shailesh Ahuja	nobody	"Simple test case to demonstrate this issue:

models.py

  {{{#!python
  
  class A(models.Model):
      pass

  class B(A):
      pass
  }}}

Run makemigrations, and migrate

Change models.py

  {{{#!python
  
  class A2(models.Model):
      pass

  class B(A2):
      pass
  }}}

Run makemigrations:

{{{
   Did you rename the main.A model to A2? [y/N] y
   Did you rename b.a_ptr to b.a2_ptr (a OneToOneField)? [y/N] y
}}}

Run migrate:
{{{
  Applying main.0002_auto_20170526_0825...Traceback (most recent call last):
  File ""manage.py"", line 22, in <module>
    execute_from_command_line(sys.argv)
  File ""<path to virtual env>/lib/python2.7/site-packages/django/core/management/__init__.py"", line 363, in execute_from_command_line
    utility.execute()
  File ""<path to virtual env>/lib/python2.7/site-packages/django/core/management/__init__.py"", line 355, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File ""<path to virtual env>/lib/python2.7/site-packages/django/core/management/base.py"", line 283, in run_from_argv
    self.execute(*args, **cmd_options)
  File ""<path to virtual env>/lib/python2.7/site-packages/django/core/management/base.py"", line 330, in execute
    output = self.handle(*args, **options)
  File ""<path to virtual env>/lib/python2.7/site-packages/django/core/management/commands/migrate.py"", line 204, in handle
    fake_initial=fake_initial,
  File ""<path to virtual env>/lib/python2.7/site-packages/django/db/migrations/executor.py"", line 115, in migrate
    state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
  File ""<path to virtual env>/lib/python2.7/site-packages/django/db/migrations/executor.py"", line 145, in _migrate_all_forwards
    state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
  File ""<path to virtual env>/lib/python2.7/site-packages/django/db/migrations/executor.py"", line 244, in apply_migration
    state = migration.apply(state, schema_editor)
  File ""<path to virtual env>/lib/python2.7/site-packages/django/db/migrations/migration.py"", line 119, in apply
    operation.state_forwards(self.app_label, project_state)
  File ""<path to virtual env>/lib/python2.7/site-packages/django/db/migrations/operations/models.py"", line 337, in state_forwards
    state.reload_models(to_reload, delay=True)
  File ""<path to virtual env>/lib/python2.7/site-packages/django/db/migrations/state.py"", line 173, in reload_models
    self._reload(related_models)
  File ""<path to virtual env>/lib/python2.7/site-packages/django/db/migrations/state.py"", line 199, in _reload
    self.apps.render_multiple(states_to_be_rendered)
  File ""<path to virtual env>/lib/python2.7/site-packages/django/db/migrations/state.py"", line 323, in render_multiple
    model.render(self)
  File ""<path to virtual env>/lib/python2.7/site-packages/django/db/migrations/state.py"", line 626, in render
    body,
  File ""<path to virtual env>/lib/python2.7/site-packages/django/db/models/base.py"", line 259, in __new__
    base.__name__,
django.core.exceptions.FieldError: Auto-generated field 'a_ptr' in class 'B' for parent_link to base class 'A' clashes with declared field of the same name.
}}}"	Bug	closed	Migrations	1.11	Normal	duplicate			Unreviewed	0	0	0	0	0	0