PyMongo：在 mongo 中更新 JSON 密钥

Question

我在更新 mongo 中的嵌套 json 结构时遇到了困难。 我正在使用 pymongo 和 Mongoengine-Rest-framework。

由于这个特殊的 json 具有动态结构并且是高度嵌套的，因此我选择使用 pymongo 而不是 mongo-engine ORM。

创建、检索和删除操作运行良好。 我想对更新问题提出一些建议。

让我们考虑一个已经存在于 mongo 中的示例对象：

st1 = {
        "name": "Some_name",
        "details": {
                    "address1": {
                        "house_no": "731",
                        "street": "Some_street",
                        "city": "some_city"
                            "state": "some_state"
                        }
                }
        }

如果我尝试通过在更新命令中发送 json st2 来将 address2 添加到详细信息中来更新 st1，其中 _id 是更新的条件，

st2 = {
        "details": {
                    "address2": {
                        "house_no": "5102",
                        "street": "Some_street",
                        "city": "some_city"
                            "state": "some_state"
                        }
                }
        }

我得到以下对象 st3 作为结果，在 mongo 中，

st3 = {
        "name": "Some_name",
        "details": {
                    "address2": {
                        "house_no": " 5102",
                        "street": "Some_street",
                        "city": "some_city"
                            "state": "some_state"
                        }
                }
        }

而不是预期的 st4 对象。

st4 = {
        "name": "Some_name",
        "details": {
                    "address1": {
                        "house_no": "731",
                        "street": "Some_street",
                        "city": "some_city"
                            "state": "some_state"
                        },
                    "address2": {
                        "house_no": "5102",
                        "street": "Some_street",
                        "city": "some_city"
                            "state": "some_state"
                        }
                }
        }

我的更新命令是：

result = collection.update_one({'_id': id}, doc)

在哪里

id: 文档的_id

文档：（此处）st2

collection: pymongo 集合对象

原始 JSON 深度为 6，键是动态的。需要在不同的深度进行更新。

Answer 1

首先，将要更新的对象更改为：

to_update = {
   "house_no": "5102",
   "street": "Some_street",
   "city": "some_city",
   "state": "some_state"
}

然后用它来更新你想要的文档的特定部分：

collection.update_one({_id: id}, { '$set': {"details.address2" : to_update} });

Answer 2

用这个来添加地址2：

collection.update({'_id': ObjectId(doc_id)}, {'$set': {'details.%s' % 'address2': address2}}, upsert=True)

结帐完整代码：

import pymongo
from bson.objectid import ObjectId

data = {"name": "Some_name",
       "details": {"address1": {"house_no": "731", "street": "Some_street", "city": "some_city", "state": "some_state"}}}

address2 = {"house_no": "731", "street": "Some_street", "city": "some_city", "state": "some_state"}

connect = pymongo.MongoClient('192.168.4.202', 20020)
database = connect['my_test']
collection = database['coll']

# # CREATE COLLECTIONS AND INSERT DATA
# _id = collection.insert(data)
# print _id

doc_id = '57568aa11ec52522343ee695'

collection.update({'_id': ObjectId(doc_id)}, {'$set': {'details.%s' % 'address2': address2}}, upsert=True)