The change in Django 3.2 to consider limit_choices_to has broken this filter.

[ndunn219]

When opening the select, the choices don't show up due to this error:

'ManyToOneRel' object has no attribute 'get_limit_choices_to'

[erwinfeser]

+1

[MDziwny]

Seems linked: https://code.djangoproject.com/ticket/32619

[n1k0]

Let me voice my +1 out loud :)

[MDziwny]

There is a workaround:

from django.db import models

class ModelA(models.Model):
    pass

class ModelB(models.Model):
    model_a = models.ForeignKey(to=ModelA, related_name="models_b")

class NonWorkingAutocompleteWithDj32(AutocompleteFilter):
    """ Autocomplete in the admin of model B """"
    title = _("Model A")
    field_name = "model_a"

class WorkingAutocompleteWithDj32(AutocompleteFilter):
    """ Autocomplete in the admin of model B """"
    title = _("Model A")
    rel_model = ModelA
    field_name = "models_b"
    parameter_name = "model_a"

[ndunn219]

There is a workaround:

@MDziwny 's workaround filtered correctly for me, but it then changes the filter field to an incorrect value (i.e., not the selection that it's being filtered on).

[MDziwny]

it then changes the filter field to an incorrect value

Oh! You're right, I didn't notice it before, thanks :/

[MDziwny]

I've opened a PR with a fix, but there is no tests yet and I'm not sure I will have time to add some.