Switch User does not work if User's Primary Key is an UUID

[elnygren]

Reverse for 'grp_switch_user' with arguments '(UUID('018aadff-27a6-471d-95aa-783d855c3237'),)' not found. 1 pattern(s) tried: ['grappelli/switch/user/(?P<object_id>\\d+)/$']

Custom User model with is_staff and is_superuser both implemented. Primary Key is an UUIDField. Grappelli 3.0.8 and latest Django.

[elnygren]

More info:

GRAPPELLI_SWITCH_USER_REGEX = "[0-9a-f-]+" in settings.py helps to get past the initial problem.

However, changing users will still break because user.id is of type UUID and is not JSON Serializable:

TypeError at /grappelli/switch/user/018aadff-27a6-471d-95aa-783d855c3237/
Object of type UUID is not JSON serializable

The problem is likely in the following row as setting original_user.id in Session won't work

django-grappelli/grappelli/views/switch.py

Line 73 in 3fd18d7

request.session["original_user"] = {"id": original_user.id, "username": original_user.get_username()}

Because Django does not support signing UUIDs (unless you cast to str first) in session:

https://github.com/django/django/blob/36ed45d27cb97fe3a41eca219ba75ff69f16b93c/django/core/signing.py#L118

[elnygren]

https://docs.djangoproject.com/en/4.2/ref/settings/#session-serializer

[sehmaschine]

@elnygren Why did you close this?

[elnygren]

@sehmaschine because session serializer can be used to fix this issue: just make it (de)serialize ULID/UUID properly with a proper JSONEncoder