Re: migrations to custom user model - complex project

Thanks Arnold, for the details.

Am 25.01.14 21:22, schrieb Arnold Krille:
> We did something similar, we switched from djangos own user model + our
> profile to just using our profile extended by email and password (no
> username anymore and no openid (yet)).
>
> What you need to do depends on whether you can keep the ID's the same
> or not. We couldn't so we had to do the following:
> - In all models that had a foreignkey on the django-user, we added
> another foreignkey on the new user (with default=null).
> - Then we added a data-migration to fill the columns for the new
> user-model with the ids.
> - In the next migration we deactivated all triggers for the
> transaction, removed the constraints for the old django-user
> reference and added constraints for the new user-model.
> - Then the references to the old django-user can be removed. And once
> you defined your user model for django.auth, you have to write your
> own migration to drop the user-model tables from django.auth
> (because south doesn't see that table and model anymore).
> - We also renamed the references to the new user-model to be same as
> the references to the old user-model before all these migrations. So
> most code didn't need changing.
> - Of course you also have to adopt your python code for the
> specialties of the new user model...
>
> If you can keep the IDs the same as before, you probably don't need to
> add a second column for the new model reference. You can 'just' remove
> the constraints from each foreignkey pointing to the old user-model and
> replace it with a constraint pointing to the new user-model. Of course,
> before you do that you need a migration creating your new user-model
> and a data-migration to copy the user-data (most importantly the IDs!)
> to the new tables.
>
> Maybe that helps,
>
> - Arnold

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