mongodb NestJS和Mongoose未按预期工作

kx5bkwkv  于 2022-12-29  发布在  Go
关注(0)|答案(1)|浏览(121)

你好!
因此,当我从数据库(JSON)请求一些数据时,它可以工作,但当尝试将数据推送到数据库中并将其发送回数据库时,它会显示以下内容:

[ { os: 'win32', sessionID: '18ef6ccf-4889-4fc6-a457-c235c5d5f16b' } ]
{ os: 'win32', sessionID: 'eb9feaf6-29c5-4481-b935-ade2ca3e82aa' }
2

为什么?
你能帮帮我吗?谢谢!
验证码:

let user = await this.usersModel.findOne({
            username: data.username,
          });

          console.log(user)

          let userSessions = await JSON.parse(user.sessions);

          console.log(userSessions);

          let newSessions = userSessions.push({
            os: process.platform,
            sessionID: sessionID,
          });

          console.log({
            os: process.platform,
            sessionID: sessionID,
          });

          console.log(newSessions);

          await this.usersModel.findOneAndUpdate(
            {
              _id: user._id,
            },
            {
              $set: {
                sessions: JSON.stringify(newSessions),
              },
            }
          );

用户集合(从MongoDB Compass导出):

[{
  "_id": {
    "$oid": "63a319a93e17b629d7bdd8f3"
  },
  "username": "Alms",
  "password": "$2b$10$jVwFs6kc93ShowPhYXwCI.bTTJHvMZUyOOjw1hXOJGV/e0wQsDQa2",
  "pfp": "default.png",
  "created_at": "Wed Dec 21 2022 15:35:21 GMT+0100 (közép-európai téli idő)",
  "__v": 0,
  "notif": "[]",
  "sessions": "2"
},{
  "_id": {
    "$oid": "63a355cd5568c9b72526a9fb"
  },
  "username": "Alms2",
  "password": "$2b$10$pYXqp0DS952HLlD3E3LXs.Y89hoYOVV82HF1ibp7Y/9ptMpEYrXce",
  "pfp": "default.png",
  "created_at": "Wed Dec 21 2022 19:51:57 GMT+0100 (közép-európai téli idő)",
  "__v": 0,
  "notif": "[]",
  "sessions": ""
},{
  "_id": {
    "$oid": "63a40c846b4dd1a7b08c51bb"
  },
  "username": "Alms3",
  "password": "$2b$10$K8TU6FijRcVOTM4x6JVo5un21dxZht6JIUHMIvWMSV0SMmKqyT1Ra",
  "pfp": "default.png",
  "created_at": "Thu Dec 22 2022 08:51:32 GMT+0100 (közép-európai téli idő)",
  "__v": 0,
  "notif": "",
  "sessions": ""
}]

a尝试的一切都在代码中。

ogq8wdun

ogq8wdun1#

Array.push返回数组的新长度,而不是数组本身。
将userSessions变量初始化为数组

let userSessions = await JSON.parse(user.sessions)

因此,在调用Array.push方法之后:

let newSessions = userSessions.push({
            os: process.platform,
            sessionID: sessionID,
          })

userSessions将包含比userSessions长1个元素的数组,newSessions将包含userSessions数组的长度。
因此,当执行更新操作时,应该发送到数据库的值是userSessions

$set: {
                sessions: JSON.stringify(userSessions),
              }

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