Data migration for model, that inherited from unmigrated app's model and have FK

[Sergey Fursov]

I have problem with migrating data in my project.
I've implemented my own comment model inherited from django.contrib.comments.Comment model, but this can be any concrete model from unmigrated app.
And now I want to migrate some data to my comment model. But I can't get full model with foreign keys, because ​this and then ​this lines throw FK away from model and finally I get this exception:

Traceback (most recent call last):
  File "./manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/home/geyser/.virtualenvs/ostankino_crm/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
    utility.execute()
  File "/home/geyser/.virtualenvs/ostankino_crm/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 377, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/geyser/.virtualenvs/ostankino_crm/local/lib/python2.7/site-packages/django/core/management/base.py", line 288, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/home/geyser/.virtualenvs/ostankino_crm/local/lib/python2.7/site-packages/django/core/management/base.py", line 338, in execute
    output = self.handle(*args, **options)
  File "/home/geyser/.virtualenvs/ostankino_crm/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 161, in handle
    executor.migrate(targets, plan, fake=options.get("fake", False))
  File "/home/geyser/.virtualenvs/ostankino_crm/local/lib/python2.7/site-packages/django/db/migrations/executor.py", line 68, in migrate
    self.apply_migration(migration, fake=fake)
  File "/home/geyser/.virtualenvs/ostankino_crm/local/lib/python2.7/site-packages/django/db/migrations/executor.py", line 102, in apply_migration
    migration.apply(project_state, schema_editor)
  File "/home/geyser/.virtualenvs/ostankino_crm/local/lib/python2.7/site-packages/django/db/migrations/migration.py", line 105, in apply
    operation.database_forwards(self.app_label, schema_editor, project_state, new_state)
  File "/home/geyser/.virtualenvs/ostankino_crm/local/lib/python2.7/site-packages/django/db/migrations/operations/special.py", line 117, in database_forwards
    self.code(from_state.render(), schema_editor)
  File "/home/geyser/coding/ostankino_crm/comments_crm/migrations/0003_auto_20150209_1643.py", line 33, in forward
    comment = MyComment(content_type=ct, object_pk=order.id, comment_type='complain', complain_status=2 if order.complaint_resolved else None, user=change_user, comment=order.status_desc, submit_date=change_date)
  File "/home/geyser/.virtualenvs/ostankino_crm/local/lib/python2.7/site-packages/django/db/models/base.py", line 452, in __init__
    raise TypeError("'%s' is an invalid keyword argument for this function" % list(kwargs)[0])
TypeError: 'user' is an invalid keyword argument for this function

Also I've attached minimal project that reproduces this error, just execute ./manage.py migrate

[Sergey Fursov]

example project

[Tim Graham]

I don't think we're going to add support for something like this. It's basically covered by ​this documentation note. You could try adding migrations for the unmigrated app (using the MIGRATION_MODULES setting).