#25313: Document how to migrate from a built-in User model to a custom User
model
-------------------------------+------------------------------------
Reporter: carljm | Owner: nobody
Type: New feature | Status: new
Component: Documentation | Version: 1.8
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
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 shaib):
<brainstorming idea="halfbaked">
Perhaps it is possible to create a migration operation for changing a
swappable model.
Something like:
{{{
ChangeSwappableModel(
setting="AUTH_USER_MODEL",
old="auth.User",
new="my_auth.User"
)
}}}
This would be a migration in the `my_auth` app.
It would need to introspect the database, checking the constraints
corresponding to `my_auth.User`'s reverse relationships, and verifying
that they indeed point to the correct table (if they point to `auth_user`,
change them; if to `my_auth_user`, leave them be; otherwise, error out).
To change the swappable model, one would:
1) Create the set of migrations for creating the new user model, porting
existing data to it, and the `ChangeSwappableModel` operation;
2) Create a "squashing" migration replacing them by just creating the new
model, so new databases don't have to suffer
I think with careful migrations embargos in the right times this could be
made to work. I don't have it in me to work out all the details now, and
I'm probably missing something essential.
</brainstorming>
--
Ticket URL: <https://code.djangoproject.com/ticket/25313#comment:7>
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