#23794: FieldDoesNotExist error in migration with deleted fields and
unique_together constraint
-------------------------------------+-------------------------------------
Reporter: heybuddy | Owner: trg
Type: Bug | Status: closed
Component: Migrations | Version: master
Severity: Normal | Resolution: fixed
Keywords: migration | Triage Stage: Accepted
unique_together removefield |
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Description changed by berto:
Old description:
> I had a model that had a ForeignKey field and a unique_together
> constraint involving that field. I deleted both the field and the
> unique_together constraint in my model and ran makemigrations. The
> migration created RemoveField operation and a AlterUniqueTogether
> operation with unique_together=set([]). When I tried to run the
> migration, a django.db.models.fields.FieldDoesNotExist exception occured.
> I edited the migration manually to put the AlterUniqueTogether operation
> before the RemoveField operation and then the migration worked.
New description:
I had a model that had a ForeignKey field and a unique_together constraint
involving that field. I deleted both the field and the unique_together
constraint in my model and ran makemigrations. The migration created
RemoveField operation and a AlterUniqueTogether operation with
unique_together=set([]). When I tried to run the migration, a
django.db.models.fields.FieldDoesNotExist exception occured. I edited the
migration manually to put the AlterUniqueTogether operation before the
RemoveField operation and then the migration worked.
NOTE: After upgrading, you must remove the bad migration file and re-run
`makemigrations` or manually move the `AlterUniqueTogether` operation
manually as stated above; i.e. upgrading does not fix the existing
migration.
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Ticket URL: <https://code.djangoproject.com/ticket/23794#comment:8>
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