Django filter on DRF with exact match of any field

Question

I'm using django filter on DRF with following model.

class Customer(models.Model):
    passport_no = models.CharField(max_length=20, blank=True, null=True)
    nic_driving_license = models.CharField(max_length=20, blank=True, null=True)
    ...

I'm sending either passport_no or nic_driving_license from the FE as id_no=<value>. How can I specify the filterset_fields to look for exact match on either of above fields? Following is not working since I think it does an AND match.

filterset_fields = {
    'passport_no': ['exact'],
    'nic_driving_license': ['exact']
}

Answer 1

With the suggestion of @wiaterb I was able to do this exactly. Posting the solution to help others. Note: No need to specify filterset_fields.

views.py

import django_filters
from django.db.models import Q

from .models import Person


class IDFilter(django_filters.FilterSet):
    id_no = django_filters.CharFilter(method='search_by_id', label='Search By ID')

    class Meta:
        model = Person
        fields = ['id_no']

    def search_by_id(self, queryset, name, value):
        return queryset.filter(
            Q(passport_no=value) | Q(nic_driving_license=value)
        )


class PersonViewSet(viewsets.ModelViewSet):
    ...
    filterset_class = IDFilter