Django-filter with DRF - How to do 'and' when applying multiple values with the same lookup?

Question

This is a slightly simplified example of the filterset I\'m using, which I\'m using with the DjangoFilterBackend for Django Rest Framework. I\'d like to be able to send a reques

Answer 1

You can create custom list field something like this:

from django.forms.widgets import SelectMultiple
from django import forms

class ListField(forms.Field):
    widget = SelectMultiple

    def __init__(self, field, *args, **kwargs):
        super(ListField, self).__init__( *args, **kwargs)
        self.field = field

    def validate(self, value):
        super(ListField, self).validate(value)
        for val in value:
            self.field.validate(val)

    def run_validators(self, value):
        for val in value:
            self.field.run_validators(val)

    def to_python(self, value):
        if not value:
            return []
        elif not isinstance(value, (list, tuple)):
            raise ValidationError(self.error_messages['invalid_list'], code='invalid_list')
        return [self.field.to_python(val) for val in value]

and create custom filter using MultipleChoiceFilter:

class ContainsListFilter(django_filters.MultipleChoiceFilter):
    field_class = ListField

    def get_filter_predicate(self, v):
        name = '%s__contains' % self.name
        try:
            return {name: getattr(v, self.field.to_field_name)}
        except (AttributeError, TypeError):
            return {name: v}

After that you can create FilterSet with your custom filter:

from django.forms import CharField

class StorageLocationFilter(django_filters.FilterSet):
    title_contains = ContainsListFilter(field=CharField())

Working for me. Hope it will be useful for you.