Method fetch_many

django/db/models/query_utils.py:299–308

(self, instances)

        instance.refresh_from_db(fields=[self.field.attname])

    def fetch_many(self, instances):
        attname = self.field.attname
        db = instances[0]._state.db
        value_by_pk = (
            self.field.model._base_manager.using(db)
            .values_list(attname, flat=True)
            .in_bulk({i.pk for i in instances})
        )
        for instance in instances:
            setattr(instance, attname, value_by_pk[instance.pk])


class class_or_instance_method: