Example code is here: GitHub - jzmiller1/edemo: Demo of RenameModel failure when M2M relationship has models with the same name
I have a django project with two apps, incidents and vault, that both have a model named Incident. The vault Incident model has an M2M involving the incidents Incident model. When the table is created for this M2M relationship the automatic field names are “from_incident_id” and “to_incident_id” since models have the same names.
If I then try to use a RenameModel in a migration…
operations = [
migrations.RenameModel(
old_name='Incident',
new_name='Folder',
),
]
it fails with this traceback:
Tracking file by folder pattern: migrations
Operations to perform:
Apply all migrations: admin, auth, contenttypes, incidents, sessions, vault
Running migrations:
Applying vault.0002_rename_incident_folder...Traceback (most recent call last):
File "/Users/zacmiller/PycharmProjects/virtualenvs/edemo/lib/python3.10/site-packages/django/db/models/options.py", line 668, in get_field
return self.fields_map[field_name]
KeyError: 'incident'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/Users/zacmiller/Library/Application Support/JetBrains/Toolbox/apps/PyCharm-P/ch-0/222.4345.23/PyCharm.app/Contents/plugins/python/helpers/pycharm/django_manage.py", line 52, in <module>
run_command()
File "/Users/zacmiller/Library/Application Support/JetBrains/Toolbox/apps/PyCharm-P/ch-0/222.4345.23/PyCharm.app/Contents/plugins/python/helpers/pycharm/django_manage.py", line 46, in run_command
run_module(manage_file, None, '__main__', True)
File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/runpy.py", line 209, in run_module
return _run_module_code(code, init_globals, run_name, mod_spec)
File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/runpy.py", line 96, in _run_module_code
_run_code(code, mod_globals, init_globals,
File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/runpy.py", line 86, in _run_code
exec(code, run_globals)
File "/Users/zacmiller/PycharmProjects/edemo/manage.py", line 22, in <module>
main()
File "/Users/zacmiller/PycharmProjects/edemo/manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "/Users/zacmiller/PycharmProjects/virtualenvs/edemo/lib/python3.10/site-packages/django/core/management/__init__.py", line 446, in execute_from_command_line
utility.execute()
File "/Users/zacmiller/PycharmProjects/virtualenvs/edemo/lib/python3.10/site-packages/django/core/management/__init__.py", line 440, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Users/zacmiller/PycharmProjects/virtualenvs/edemo/lib/python3.10/site-packages/django/core/management/base.py", line 402, in run_from_argv
self.execute(*args, **cmd_options)
File "/Users/zacmiller/PycharmProjects/virtualenvs/edemo/lib/python3.10/site-packages/django/core/management/base.py", line 448, in execute
output = self.handle(*args, **options)
File "/Users/zacmiller/PycharmProjects/virtualenvs/edemo/lib/python3.10/site-packages/django/core/management/base.py", line 96, in wrapped
res = handle_func(*args, **kwargs)
File "/Users/zacmiller/PycharmProjects/virtualenvs/edemo/lib/python3.10/site-packages/django/core/management/commands/migrate.py", line 349, in handle
post_migrate_state = executor.migrate(
File "/Users/zacmiller/PycharmProjects/virtualenvs/edemo/lib/python3.10/site-packages/django/db/migrations/executor.py", line 135, in migrate
state = self._migrate_all_forwards(
File "/Users/zacmiller/PycharmProjects/virtualenvs/edemo/lib/python3.10/site-packages/django/db/migrations/executor.py", line 167, in _migrate_all_forwards
state = self.apply_migration(
File "/Users/zacmiller/PycharmProjects/virtualenvs/edemo/lib/python3.10/site-packages/django/db/migrations/executor.py", line 252, in apply_migration
state = migration.apply(state, schema_editor)
File "/Users/zacmiller/PycharmProjects/virtualenvs/edemo/lib/python3.10/site-packages/django/db/migrations/migration.py", line 130, in apply
operation.database_forwards(
File "/Users/zacmiller/PycharmProjects/virtualenvs/edemo/lib/python3.10/site-packages/django/db/migrations/operations/models.py", line 422, in database_forwards
old_m2m_model._meta.get_field(old_model._meta.model_name),
File "/Users/zacmiller/PycharmProjects/virtualenvs/edemo/lib/python3.10/site-packages/django/db/models/options.py", line 670, in get_field
raise FieldDoesNotExist(
django.core.exceptions.FieldDoesNotExist: Incident_incidents has no field named 'incident'
am I just doing something wrong or is this an edge case that Django missed?