Question

通过使用位置运算符，使用feathersjs update函数更新数据时遇到问题。我在mongoDB中有以下JSON文档：

{
"name" : "John Jonson",
    "payments" : [
        {
            "year" : 2016,
            "payments" : [
                {
                    "comment" : "",
                    "title" : "1 payment",
                    "amount" : 100,
                    "date" : ISODate("2016-12-20T15:04:09.647Z")
                }
            ]
        },
        {
            "year" : 2015,
            "payments" : [
                {
                    "comment" : "first payment",
                    "title" : "02/04/2015",
                    "amount" : 150,
                    "date" : ISODate("2016-12-20T15:10:04.499Z")
                },
                {
                    "comment" : "second payment",
                    "title" : "05/06/2015",
                    "amount" : 150,
                    "date" : ISODate("2016-12-20T15:10:04.499Z")
                }
            ]
        }
    ]
}

我尝试通过推送到payment.payments数组来更新此文档，该对象仅存在于2015年年份的对象：

var data = {
      _id: "5a16e032b7a982bc9b7bd7fe",
      payment: {
         "amount": 200,
         "title": "09/02/2016",
         "comment": ""
      }
    }

app.service('payments').update({_id: data._id, "payments.year": 2015}, {$push: { "payments.$.payments": data.payment }}, { "multi": true }, (error, result) => {
        console.log(error)
        console.log(result)
    });

在调用上述函数后，我收到以下消息：

"exception: The positional operator did not find the match needed from the query. Unexpanded update: payments.$.payments"

但是当我在mongo shell中使用这个语句时，一切都很好：

db.payments.update({"_id" : ObjectId("5a16e032b7a982bc9b7bd7fe"), "payments.year": 2015}, {$push: { "payments.$.payments": {"amount":200,"title":"09/02/2016","comment":""}}}, {"multi": true});

*我解决了我的问题。我使用补丁方法：*

var query = {_id: data._id, "payments.year": 2015}

app.service('payments').patch(null, {$push: { "payments.$.payments": data.payment }}, { query }, (error, result) => {
    console.log(error)
    console.log(result)
});

我只有一个问题。为什么上面的代码工作正常，但下面的代码没有？

app.service('payments').patch(null, {$push: { "payments.$.payments": data.payment }}, {_id: data._id, "payments.year": 2015}, (error, result) => {
    console.log(error)
    console.log(result)
});

Answer 1

工作代码中的query使用属性值缩写。羽毛mongodb适配器补丁方法采用query参数，所以试试这个：

app.service('payments').patch(null, {$push: { "payments.$.payments": data.payment }}, {query: { _id: data._id, "payments.year": 2015 }}, (error, result) => {
  console.log(error)
  console.log(result)
});

位置操作员不使用feathersjs查询更新

1 个答案: