如何在mongoDB中集成python编写自动操作

Question

我创建了collection fee_details.

{
    "_id": "fee_details",
    "name": "Tution fees",
    "student_total": 30,
    "fee_notpaid": 29,
    "fee_paid_by": [{
    "stu_name": "jaya",
    "date": "10-09-2014"
    }]
}

我试图使用下面的查询输入fee_paid_by详细信息:

 db.fee_details.findAndModify({
    query: {
    "_id": "fee_details",
    "fee_notpaid": {
        $gt: 0
    }
    },
    update: {
    $inc: {
        "fee_notpaid": -1
    },
    $push: {
        "fee_paid_by": {
            "stu_name": "jaya",
            "date": "10-09-2014"
        }
    }
    }
})

在命令行上执行，并将fee_paid_by详细信息添加到fee_details集合中。但我尝试执行以下查询集成与python

c = db.fee_details.find_and_modify({
    '$query': {
    "_id": "fee_details",
    "fee_notpaid": {
        '$gt': 0
    }
    },
    '$update': {
    '$inc': {
        "fee_notpaid": -1
    },
    '$push': {
        "fee_paid_by": {
            "stu_name": s_name,
            "fee": fee
        }
    }
    }
})

当执行上面的代码时，它给出一个错误either must remove or update

在fee_details Collection中输入fee_paid_by详细信息的正确方法是什么??

Answer 1

.find_and_modify 接受关键字参数，且密钥名称不应以$符号开头。

>>> import pymongo
>>> client = pymongo.MongoClient()
>>> db = client.test
>>> col = db.collection
>>> name = 'jaya'
>>> fee = 11
>>> query = {'_id': 'free_details', 'free_notpaid': {'$gt':0}}
>>> update = {'$inc': {'free_notpaid': -1}, '$push': {'free_paid_by': {'stu_name': name, 'fee': fee}}}
>>> col.find_and_modify(query=query, update=update)

---

find_and_modify方法是DEPRECATED自pymongo 3.0以来，您应该使用find_one_and_delete()， find_one_and_replace()或find_one_and_update()来代替

>>> col.find_one_and_update(filter=query, update=update)