如何使用对象保存或更新？

Question

我正在编写以下代码来upsert mongodb：

def save_qs(self, qs)
    try:
        existed = QuerySetRecord.objects.get(recordId=qs.recordId)
        if qs.count > existed.count:
            qs._id = existed._id
            qs.save()
    except DoesNotExist as e:
        qs.save()

我在_id方法中找到了mongoengine check save，如果obj有_id，请执行insert，如果没有则更新。

created = ('_id' not in doc or self._created or force_insert)

但我知道这不是那么好，我怎么能做得更好？

以下是QuerySet：

class QuerySetRecord(Document):
    recordId = StringField(required=True)
    crawlerName = StringField(required=True)
    recordType = StringField(required=True)
    dataMap = DictField(required=True)
    priority = IntField()
    count = IntField()
    valid = BooleanField(required=True)