def filter_queryset(self, queryset):
    filter_backends = (DjangoFilterBackend, )

    # Other condition for different filter backend goes here

    for backend in list(filter_backends):
        queryset = backend().filter_queryset(self.request, queryset, view=self)
    return queryset

def list(self, request, *args, **kwargs):
    """
     Method for Post listing. It can be accessed by anyone.
     """

    serializer = PostListSerializer(self.filter_queryset(self.get_queryset()), many=True, context= . 
     {"request": request})

    return Response(serializer.data)