

def do_filter(self, engine_slug, queryset, search_text):
    'Performs the full text filter.'
    model = queryset.model
    content_type = ContentType.objects.get_for_model(model)
    pk = model._meta.pk
    if has_int_pk(model):
        ref_name = 'object_id_int'
    else:
        ref_name = 'object_id'
    return queryset.extra(tables=('watson_searchentry',), where=('watson_searchentry.engine_slug = %s', "watson_searchentry.search_tsv @@ to_tsquery('{search_config}', %s)".format(search_config=self.search_config), 'watson_searchentry.{ref_name} = {table_name}.{pk_name}'.format(ref_name=ref_name, table_name=connection.ops.quote_name(model._meta.db_table), pk_name=connection.ops.quote_name((pk.db_column or pk.attname))), 'watson_searchentry.content_type_id = %s'), params=(engine_slug, self.escape_postgres_query(search_text), content_type.id))

dataset/ETHPy150Open etianen/django-watson/src/watson/backends.py PostgresSearchBackend.do_filter/original