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The change partly goes back to the old behavior for forwards migrations which should reduce the amount of memory consumption (#24745). However, by the way the current state computation is done (there is no `state_backwards` on a migration class) this change cannot be applied to backwards migrations. Hence rolling back migrations still requires the precomputation and storage of the intermediate migration states. This improvement also implies that Django does not handle mixed migration plans anymore. Mixed plans consist of a list of migrations where some are being applied and others are being unapplied. Thanks Andrew Godwin, Josh Smeaton and Tim Graham for the review as well as everybody involved on the ticket that kept me looking into the issue.
Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design. Thanks for checking it out. All documentation is in the "docs" directory and online at https://docs.djangoproject.com/en/stable/. If you're just getting started, here's how we recommend you read the docs: * First, read docs/intro/install.txt for instructions on installing Django. * Next, work through the tutorials in order (docs/intro/tutorial01.txt, docs/intro/tutorial02.txt, etc.). * If you want to set up an actual deployment server, read docs/howto/deployment/index.txt for instructions. * You'll probably want to read through the topical guides (in docs/topics) next; from there you can jump to the HOWTOs (in docs/howto) for specific problems, and check out the reference (docs/ref) for gory details. * See docs/README for instructions on building an HTML version of the docs. Docs are updated rigorously. If you find any problems in the docs, or think they should be clarified in any way, please take 30 seconds to fill out a ticket here: https://code.djangoproject.com/newticket To get more help: * Join the #django channel on irc.freenode.net. Lots of helpful people hang out there. Read the archives at http://django-irc-logs.com/. * Join the django-users mailing list, or read the archives, at https://groups.google.com/group/django-users. To contribute to Django: * Check out https://docs.djangoproject.com/en/dev/internals/contributing/ for information about getting involved. To run Django's test suite: * Follow the instructions in the "Unit tests" section of docs/internals/contributing/writing-code/unit-tests.txt, published online at https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/unit-tests/#running-the-unit-tests