Filter by multiple years in DRF - django

Question

So I'm trying to do filter by year and so it could use multiple values like this
filter?year=2000,2021
And with this I should get all objects with year 2000 or 2021
My filter.py
from django_filters import(
BaseInFilter,
NumberFilter,
FilterSet,
CharFilter,
)
from .models import Research
class YearInFilter(BaseInFilter, NumberFilter):
pass
class ResarchFilter(FilterSet):
year = YearInFilter(field_name='date', lookup_expr='year')
category = CharFilter(field_name='category', lookup_expr='iexact')
class Meta:
model = Research
fields = ['date', 'category']
It looks almost like example from django-filter.
But when I'm trying to use it i've got an error Field 'None' expected a number but got [Decimal('2000'), Decimal('2021')].
My views.py
class ResarchCategoryYear(generics.ListCreateAPIView):
queryset = Research.objects.all()
serializer_class = ResearchSerializer
filter_backends = (filters.DjangoFilterBackend,)
filterset_class = ResarchFilter
So what's wrong here? Why here is Decimal? Why it's not number? And how make it work like expected?

Answer 1

If you want all data between this two year, use range
if you want only the data that is exists in those years, use in
example:
year = YearInFilter(field_name='date', lookup_expr='range')
year = YearInFilter(field_name='date', lookup_expr='in')
Please check how you can exactly apply those filters in Django_filter
edit:
you can make a custom search method in this way:
def custom_filter(self, queryset, value, *args, **kwargs):
if not value:
return queryset
handleValue = value.split(',')
queryset = YourModel.objects.filter(your_field__in=handleValue).distinct()
return queryset
use it like this:
rest_framework.CharFilter(method=custom_filter)
and you can replace CharFilter based on what you want
Best of luck