CODEWITHSUNDEEP
djangodjango-filterdjango-2.1django-filters
Rostislav Ruban
Rostislav Ruban

Reputation: 127

Cannot resolve keyword 'model' into field. Django filters

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.

Upvotes: 2

Views: 1330

Answers (2)

Ashen One
Ashen One

Reputation: 411

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

Upvotes: 2

Higor Rossato
Higor Rossato

Reputation: 2046

By looking at the docs you can see that the to_name_field is gonna be mapped out to a Django field in your model, hence why you're getting the error that Django cannot "resolve field location_district" because there's no location_district in your models. Despite have never used DjangoFilters I believe that if you really need to name that field, you can point that to the location. Meaning that your filter would like something like:

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

Or you can try this but beware that I have no idea if it'll work

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

Upvotes: 1

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