Make migrations work with swappable models.
After the custom user model was brought upon the Django community, it had all the attention it well deserved and more and more re-usable apps are providing support for custom user models.
I’ve been working with django-oscar and many of its extensions over the past two years. Oscar added support for the custom user models in its 0.6 release and django-fancypages even goes beyond that and leverages the (hidden) swappable API.
One of the few things that could be considered troublesome with models that are swappable, is providing compatible South migrations. Over the last few months, I’ve had to touch enough migrations and replace auth.User with AUTH_USER_MODEL to be annoyed by it and automate the situation.
Behold swapify, the little commandline tool that fixes your migrations for a swappable model of your choice (on at a time). It checks your migration files for you swappable and updates the migrations if required.
This is a first attempt based on my own experiences. There’s probably uncovered ground and potential for improvement out there…so feedback is very welcome.
You can either install the latest release from PyPI:
pip install swapify
or install the latest development version from github:
pip install https://github.com/elbaschid/swapify/archive/master.tar.gz
Get a list of all migrations in a directory that require fixing:
swapify list myproject/ --model auth.User
Update all migrations to work with swapped models:
swapify apply myproject/ --model auth.User
You can also test updating the files and get the output on stdout:
swapify apply myproject/ --model auth.User --dry-run
And for very custom models you can even do:
swapify apply myproject/ --model swap.Swappable --var-name MYSWAP_SWAPPABLE_MODEL
swapify is available under the MIT license.