如何确定是否在monsengine的upsert过程中插入了没有get_or_create(不推荐使用)的内容?

问题描述

我需要知道是否使用MongoEngine(或必要时使用pymongo)插入了upsert.

I need to know if an upsert inserted, using MongoEngine (or if necessary, pymongo).

代码如下:

ret = MyMongoCollection.objects(name=desiredname)
            .update_one( { upsert: True, field1: 2 } )

根据定义，Mongoengine似乎只返回"num_affected"，此处始终始终为1.

Mongoengine seems to return only "num_affected" which is always exactly 1 here, by definition.

我知道它们存在，但是我正在寻找Python风格.

I know these exist, but I'm looking for the Python flavor.

• 如何插入"不存在，否则更新"用mongoengine?
• 检查MongoDB upsert是否进行了插入或更新

• How to do "insert if not exist else update" with mongoengine?
• Check if MongoDB upsert did an insert or an update

推荐答案

这是另一个使用pymongo的答案，总是提供相关ID.上面的update()答案仅在字段为新字段时为您提供ID.

Here's another answer using pymongo that always provides the relevant ID. The update() answer above only gives you the ID if the field is new.

upsert_results = MyMongoCollection._get_collection().find_and_modify(
    {
        'name':desiredName, 
        # NOTE: _cls (below) only necessary if you meta.allow_inheritance=True
        '_cls': MyMongoCollection._class_name 
    }, 
    {'$set': {'field1': 2}}, # always provide a $set even if {} or it will no-op.
    upsert=True, full_response=True, new=True, fields=['_id'])

obj_id = upsert_results['value']['_id']
obj_created = not upsert_results['lastErrorObject']['updatedExisting']

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