#32267: Unable to unapply a branch of migrations
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Reporter: Roman Odaisky | Owner: nobody
Type: New feature | Status: closed
Component: Migrations | Version: 3.1
Severity: Normal | Resolution: invalid
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Mariusz Felisiak):
> Can we at the very least add something like `manage.py migrate
--unapply-one <app> <migration>` that would unapply one migration, having
ensured that no currently applied migrations depend on it? This will solve
the use case I outlined and maybe some others while not being able to
corrupt the DB state.
Migrations can be reversed, see
[https://docs.djangoproject.com/en/3.1/topics/migrations/#reversing-
migrations docs]. However adding an option to reverse a specific migration
doesn't sound like a good idea, we will not be able to ensure that a
database state is not corrupted. Migrations history must be continuous.
You're talking about reversing migrations in a database but without
continuous changes reflected in migrations. So you would like to drop a
feature branch, reverse its migrations and have a clear path without
migrations from the feature branch, and yes you can do this but outside of
Django migrations. The proper way do this in Django is to reverse code
changes from the feature branch and run `makemigrations` that will create
a new migration reversing db changes.
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Ticket URL: <https://code.djangoproject.com/ticket/32267#comment:4>
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