filters.py

from haystack.query import SearchQuerySet
from rest_framework import filters


class AutocompleteFilterBackend(filters.BaseFilterBackend):
    def filter_queryset(self, request, queryset, view):
        autocomplete = request.GET.get('q')
        if autocomplete:
            sqs = SearchQuerySet().filter(autocomplete=autocomplete)

            return queryset.filter(pk__in=[sq.pk for sq in sqs])
        return queryset