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create_anonymous_user() breaks on migration rollback #770

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ZbigniewRA opened this issue Jan 30, 2022 · 0 comments
Open

create_anonymous_user() breaks on migration rollback #770

ZbigniewRA opened this issue Jan 30, 2022 · 0 comments

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@ZbigniewRA
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post_migrate handler create_anonymous_user() breaks when a migration that adds a field to the User model is rolled back.

Bug is in this line:

User.objects.using(kwargs['using']).get(**lookup)

The problem is that get() tries to fetch all fields, but some of the fields no longer exist (as they were removed in a rollback).

A fix is to fetch the only field we know exists:

User.objects.using(kwargs['using']).filter(**lookup).only(User.USERNAME_FIELD).get()
@akikoskinen akikoskinen mentioned this issue Nov 29, 2022
Merged
akikoskinen added a commit to City-of-Helsinki/open-city-profile that referenced this issue Nov 30, 2022
@akikoskinen
HP-1429 Disable django-guardian's anonymous user support
35de6f6 
Django-guardian supports giving Django's permissions to anonymous users.
This feature has an issue when a field is added or removed in the User
model: an exception gets thrown after the migration is run [1].

Open-city-profile doesn't currently use this feature. It can be disabled
by setting the `ANONYMOUS_USER_NAME` setting to `None` [2].

[1] django-guardian/django-guardian#770
[2] https://django-guardian.readthedocs.io/en/stable/configuration.html#anonymous-user-name
@kmmbvnr kmmbvnr mentioned this issue May 6, 2024
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@ZbigniewRA