django-rest-swagger

I'm working with Django rest framework API, I am trying to make a filter by first_name or by last_name or by both of them. This is my ContactViewSet.py : class ContactViewSet(viewsets.ModelViewSet): queryset = Contact.objects.all() serializer_class = ContactSerializer filter_backends = (DjangoFilterBackend, ) filter_fields = ('first_name', 'last_name') lookup_field = 'idContact' My DRF's settings : REST_FRAMEWORK = { 'DEFAULT_FILTER_BACKENDS': ('django_filters.rest_framework.DjangoFilterBackend',), } My actuel request url looks like : http://localhost:8000/api/v1/contacts/?first_name=Clair