#35424: Migration autodetector fails when order_with_respect_to is removed, but
an
_order field remains
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Reporter: Stuart Attenborrow | Owner: nobody
Type: Bug | Status: closed
Component: Migrations | Version: 4.2
Severity: Normal | Resolution: worksforme
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 1 | UI/UX: 0
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Comment (by Stuart Attenborrow):
Error shown below. I've added a zip that contains the same project, but
with docker compose, and a poetry lock file to ensure we're looking at the
same thing. Note I can reproduce this both in a docker container, and on a
production EC2 instance using system python and virtual envs.
{{{
/code/mysite# python manage.py migrate
Operations to perform:
Apply all migrations: admin, auth, contenttypes, polls, sessions
Running migrations:
No migrations to apply.
Traceback (most recent call last):
File "/code/mysite/manage.py", line 22, in <module>
main()
File "/code/mysite/manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "/opt/venv/lib/python3.11/site-
packages/django/core/management/__init__.py", line 442, in
execute_from_command_line
utility.execute()
File "/opt/venv/lib/python3.11/site-
packages/django/core/management/__init__.py", line 436, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/opt/venv/lib/python3.11/site-
packages/django/core/management/base.py", line 412, in run_from_argv
self.execute(*args, **cmd_options)
File "/opt/venv/lib/python3.11/site-
packages/django/core/management/base.py", line 458, in execute
output = self.handle(*args, **options)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/venv/lib/python3.11/site-
packages/django/core/management/base.py", line 106, in wrapper
res = handle_func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/venv/lib/python3.11/site-
packages/django/core/management/commands/migrate.py", line 335, in handle
changes = autodetector.changes(graph=executor.loader.graph)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/venv/lib/python3.11/site-
packages/django/db/migrations/autodetector.py", line 46, in changes
changes = self._detect_changes(convert_apps, graph)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/venv/lib/python3.11/site-
packages/django/db/migrations/autodetector.py", line 197, in
_detect_changes
self.generate_altered_fields()
File "/opt/venv/lib/python3.11/site-
packages/django/db/migrations/autodetector.py", line 1117, in
generate_altered_fields
old_field = self.from_state.models[app_label,
old_model_name].get_field(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/venv/lib/python3.11/site-
packages/django/db/migrations/state.py", line 765, in get_field
return self.fields[field_name]
~~~~~~~~~~~^^^^^^^^^^^^
KeyError: None
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/35424#comment:5>
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