admin lookup_allowed incorrectly returns False for a nested reverse OneToOneField

[Tobias Krönke]

Assume these 3 models in an app called foo:

class Somebody(models.Model):
    user = models.OneToOneField(AUTH_USER_MODEL)

class Profile(models.Model):  # we want an admin for this and filter on related data!
    who = models.OneToOneField(Somebody)

class ClientInfo(models.Model):
    who = models.OneToOneField(Somebody)
    filter_by_me_please = models.CharField(db_index=True, max_length=20, blank=True)

and this profile admin:

class ProfileAdmin(admin.ModelAdmin):
    list_filter = ('who__clientinfo__filter_by_me_please', )

admin.site.register(Profile, ProfileAdmin)

I get this error

DisallowedModelAdminLookup at /admin/foo/profile/
Filtering by who__clientinfo__filter_by_me_please not allowed

on opening ​http://localhost:8000/admin/foo/profile/?who__clientinfo__filter_by_me_please=yay

The 3 lookup levels seem to be important to reproduce this.

[Tim Graham]

Reproduced at a4e9e834e3dfc8d5a024a78c765f193105d41a48.

[Mariusz Felisiak]

​PR

[Tobias McNulty]

Reviewing at DUTH sprint.

[Mariusz Felisiak]

I don't have idea how to fix this without breaking admin_views.tests.AdminViewBasicTest.test_disallowed_filtering.

[Anton Samarchyan]

I added a project to easily reproduce the problem. Admin credentials - admin/iaN4viph8653 .
/admin/app/profile/?whoclientinfofilter_by_me_please=test&whodepartmentcode=123

[Anton Samarchyan]

I added a ​PR

[Tim Graham <timograham@…>]

In b27166b:

Fixed #27356 -- Fixed ModelAdmin.lookup_allowed() for some nested relations.