[Django] #36126: DisallowedModelAdminLookup on simple filters of FK fields with inheritance child model as target

[Django]

#36126: DisallowedModelAdminLookup on simple filters of FK fields with inheritance
child model as target
-------------------------------+-----------------------------------------
Reporter: Omar BENHAMID | Type: Bug
Status: new | Component: contrib.admin
Version: 5.1 | Severity: Normal
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------+-----------------------------------------
To reproduce :

1. Have an FK to a model which inherits another in models.py :

{{{
class Parent(Model):
#...
pass


class Child(Parent):
#...
pass

class FooBar(Model):
child = ForeignKey(Child, on_delete=models.CASCADE)
}}}

2. Have a simple list filter on that fk admin.py:
{{{
class FooBarModelAdmin(ModelAdmin):
model = FooBar
list_filter = ("child",)
}}}

3. Go to the admin of FooBar and try to filter by "child" you get :
{{{
django.contrib.admin.exceptions.DisallowedModelAdminLookup: Filtering by
child__parent_ptr__exact not allowed
}}}

**Workaround:** override {{{lookup_allowed(...)}}} in the
FooBarModelAdmin to allow lookup on {{{child__parent_ptr__exact}}}.

I think that the better fix would be to filter by child_exact rather than
{{{child__parent_ptr__exact}}}to avoid exposing some "unnecessary"
technical detail, but maybe it has side effects, so the default
{{{lookup_allowed(...)}}} should at least allow it.
--
Ticket URL: <https://code.djangoproject.com/ticket/36126>
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[Django]

#36126: DisallowedModelAdminLookup on simple filters of FK fields with inheritance
child model as target
-------------------------------+--------------------------------------

Reporter: Omar BENHAMID | Owner: (none)
Type: Bug | Status: closed
Component: contrib.admin | Version: 5.1
Severity: Normal | Resolution: worksforme

Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------+--------------------------------------

Changes (by Sarah Boyce):

* resolution: => worksforme
* status: new => closed

Comment:

Tested on main and 5.1, couldn't replicate the error
--
Ticket URL: <https://code.djangoproject.com/ticket/36126#comment:1>