Django multitenant migration raises KeyError: "prune"-CodePudding

So I've been working in a project for a while, and haven't really changed the models at all, and therefore haven't done any migrations. Now I needed to add two new fields and delete another one, which should be normally fine. I'm using django-tenants, so my command to run the migrations is ./manage.py migrate_schemas. Now, whenever I run that, I get the error KeyError: "prune" (the full traceback is below) in what seems to be internal code of Django.

Now, afterwards I tried reverting my changes, so no new migration and running the comnad again, and got the same error. I also thought that maybe the database had gotten "dirty" at some point, so I tried migrating a clean database from scratch, with the same result. The migrations don't even get to start.

Has anyone ever encountered something similar?

The full traceback (I have simplified the paths)

[standard:public] === Starting migration
Traceback (most recent call last):
  File ":directory/./manage.py", line 22, in <module>
    main()
  File ":directory/./manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "$venv/lib/python3.9/site-packages/django/core/management/__init__.py", line 446, in execute_from_command_line
    utility.execute()
  File "$/lib/python3.9/site-packages/django/core/management/__init__.py", line 440, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "$venv/lib/python3.9/site-packages/django/core/management/base.py", line 402, in run_from_argv
    self.execute(*args, **cmd_options)
  File "$venv/lib/python3.9/site-packages/django/core/management/base.py", line 448, in execute
    output = self.handle(*args, **options)
  File "$venv/lib/python3.9/site-packages/django_tenants/management/commands/migrate_schemas.py", line 52, in handle
    executor.run_migrations(tenants=[self.PUBLIC_SCHEMA_NAME])
  File "$venv/lib/python3.9/site-packages/django_tenants/migration_executors/standard.py", line 11, in run_migrations
    run_migrations(self.args, self.options, self.codename, self.PUBLIC_SCHEMA_NAME)
  File "$venv/lib/python3.9/site-packages/django_tenants/migration_executors/base.py", line 53, in run_migrations
    MigrateCommand(stdout=stdout, stderr=stderr).execute(*args, **options)
  File "$venv/lib/python3.9/site-packages/django/core/management/base.py", line 448, in execute
    output = self.handle(*args, **options)
  File "$venv/lib/python3.9/site-packages/django/core/management/base.py", line 96, in wrapped
    res = handle_func(*args, **kwargs)
  File "$venv/lib/python3.9/site-packages/django/core/management/commands/migrate.py", line 188, in handle
    if options["prune"]:
KeyError: 'prune'

CodePudding user response：

It seems like version incompatibility.

prune option added to Django couple months ago (Jan 22, 2022)

If you want to use newer Django you have to patch django-tenants manually and add --prune argument

def add_arguments(self, parser):
    parser.add_argument(
        '--prune', action='store_true', dest='prune',
        help='Delete nonexistent migrations from the django_migrations table.',
    )

_{PS I couldn't find issue related to prune, so you may create new one ;)}