Cannot resolve keyword 'model' into field. Django filters

Question

I tried to rewrite filters, written on Django 1.1 to 2.1

I have a complex model, called Apartment that includes a Location model. Location includes the District model.

So, there my models code:

class District(models.Model):
    district_number = models.IntegerField(_('district'))
    title = models.CharField(_('district name'), max_length=100)
    city = models.ForeignKey(City, on_delete=models.PROTECT)

    class Meta:
        unique_together = ('city', 'district_number',)

    def __str__(self):
        return self.title

class Location(models.Model):
    apartment = models.OneToOneField(Apartment, related_name='location', on_delete=models.CASCADE)
    coordinate_long = models.DecimalField(max_digits=15, decimal_places=10)
    coordinate_lat = models.DecimalField(max_digits=15, decimal_places=10)
    zip_code = models.IntegerField(_('zip'))
    district = models.ForeignKey(District, on_delete=models.PROTECT)
    subway_station = models.ForeignKey(SubwayStation, on_delete=models.PROTECT)
    city = models.ForeignKey(City, on_delete=models.PROTECT)
    address = models.CharField(_('human readable address of apartment'), max_length=250)

    def __str__(self):
        return self.address

and filter is

district = django_filters.ModelMultipleChoiceFilter(
    name="location_district",
    queryset=District.objects.all(),
)

At new version I changed name to to_field_name.

When I tried to launch, this drop an error - Cannot resolve keyword 'district' into field. Choices are: apartment_type, apartment_type_id, bedrooms_count, co_ownership, date_added, descriptions, economy_effective, economy_effective_id, energy_effective, energy_effective_id, favorite_lists, financial_info, floor, id, is_published, location, manager, manager_id, photos, plan, price, publish_type, publish_type_id, rooms, rooms_count, services, square, title, video_url

I don't really understand how the ModelMultipleChoiceFilter works, and how can I get the nested model District from Location on it.

Answer 1

Change ModelMultipleChoiceFilter name to field_name, that works well for me.