Javascript 如何使用node.js中的monk更新mongodb中的嵌套字段

我在用新记录更新我的mongodb数据库方面有点困难。数据库由练习字段组成，这些字段是数组，当我执行PUT标题时，我希望使用新记录更新特定练习，而不是覆盖特定练习的整个字段，因为我希望保留进度的历史记录。到目前为止，我只能得到router.GET（“/：昵称/：信息”）中看到的特定嵌套字段，在这里我们可以指定用户及其姓名、年龄或性别。我可以在练习场上做同样的练习，但我一直无法更新这些练习。以下是数据库：

[
{
    "_id": "59283956c52a5420e74966b9",
    "info": {
      "nickname": "annwumy",
      "name": "Bert",
      "gender": "male",
      "age": 25
    },
    "exercises": [
      {
        "exercise": {
          "name": "squats",
          "records": []
        }
      },
      {
        "exercise": {
          "name": "legpresses",
          "records": []
        }
      },
      {
        "exercise": {
          "name": "deadlifts",
          "records": []
        }
      },
      {
        "exercise": {
          "name": "benchpresses",
          "records": []
        }
      },
      {
        "exercise": {
          "name": "pullups",
          "records": []
        }
      },
      {
        "exercise": {
          "name": "shoulderpress",
          "records": []
        }
      },
      {
        "exercise": {
          "name": "curls",
          "records": []
        }
      }
    ]
  },
  {
    "_id": "5928397fc52a5420e74966ba",
    "info": {
      "nickname": "mmsmsy",
      "name": "Mateusz",
      "gender": "male",
      "age": 26
    },
    "exercises": [
      {
        "exercise": {
          "name": "squats",
          "records": []
        }
      },
      {
        "exercise": {
          "name": "legpresses",
          "records": []
        }
      },
      {
        "exercise": {
          "name": "deadlifts",
          "records": []
        }
      },
      {
        "exercise": {
          "name": "benchpresses",
          "records": []
        }
      },
      {
        "exercise": {
          "name": "pullups",
          "records": []
        }
      },
      {
        "exercise": {
          "name": "shoulderpress",
          "records": []
        }
      },
      {
        "exercise": {
          "name": "curls",
          "records": []
        }
      }
    ]
  }
]

以下是请求的后端代码：

const express = require('express');
const router = express.Router();
const app = express();
const cors = require('cors');
const bodyParser = require('body-parser');
const axios = require('axios');

const monk = require('monk');
const db = require('monk')('localhost/fitness-log');
const users = db.get('users');

app.use(cors());
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: true}));

app.use('/api/v1', router);


router.get('/listusers', (req, res) => {
  users.find()
    .then(users => res.json(users))
});

router.get('/users/:id', (req, res) => {
  users.find({'_id': req.params.id})
    .then(user => res.json(user[0]))
});

router.get('/:nickname/:info', (req, res) => {
  users.find({'nickname': req.params.nickname}, `info.${req.params.info}`)
    .then(user => res.json(user[0]))
});

router.post('/adduser', (req, res) => {
  users.insert(req.body, (err, result) => {
    res.send(
      (err === null) ? { msg: result } : { msg: err }
    );
  });
});

router.put('/updateinfo/:nickname/:info', (req, res) => {
  const updateQuery = {$set: {}};
  updateQuery.$set[`info.${req.params.info}`] = req.body.value;
  users.update({'nickname': req.params.nickname}, updateQuery, (err, result) => { 
    res.send(
      (err === null) ? { msg: result } : { msg: err }
    );
  });
});

router.put('/addrecord/:nickname/:exercise', (req, res) => {
  const updateQuery = {$push: {}};
  updateQuery.$push[`exercises.${req.params.exercise}`] = req.body;
  users.update({'nickname': req.params.nickname}, updateQuery, (err, result) => { 
    res.send(
      (err === null) ? { msg: result } : { msg: err }
    );
  });
});

router.delete('/deleteuser/:nickname', (req, res) => {
  users.remove({ 'nickname': req.params.nickname }, err => {
    res.send((err === null) ? { msg: '' } : { msg: 'error: ' + err});
  });
});

router.delete('/deleteallusers', (req, res) => {
  users.remove({}, err => {
    res.send(err === null) ? {msg: '' } : { msg: 'error: ' + err};
  });
});

app.listen(3001, () => console.log("Server running at 3001"));

---

错误在更新表达式中：

{$set: `info.${req.params.info}`}

它必须是：

const updateQuery = {$set: {}};
updateQuery.$set[`info.${req.params.info}`] = req.params.infoValue;
users.update({'nickname': req.params.nickname}, updateQuery, (err, result) => { 

---

很好的提示。非常感谢。我已经更新了代码，因此它更新了特定的练习。当我尝试输入新记录时，它仍然会覆盖运动记录。我希望它将新记录存储在对象数组中前一个记录的旁边。不过，你建议的方法可以很好地更新用户名、年龄和性别信息。你需要更改文档结构。将练习更改为数组，并使用$push而不是$set插入新练习-您是魔术师。：）非常感谢，当我在更新查询中将$set更改为$push时，一切都正常了。很高兴为您提供帮助：）我已经重新创建了数据库架构，以便更容易访问和映射前端的练习，但是现在我又在努力更新正确的字段。你知道如何编辑$push方法来更新正确的练习吗。练习。[指定的\u name]记录是“name”字段旁边的字段？