如何用node.js中的monk更新mongodb中的嵌套字段
我正在用新logging更新我的mongodb数据库。 数据库由数组组成的练习字段组成，当我做一个PUT头时，我想用新logging更新具体练习，而不是覆盖特定练习的整个领域，因为我想保留进度的历史logging。 到目前为止，我只能得到在router.get（'/：昵称/：info'）中看到的特定的嵌套字段，我们可以在其中指定用户及其名称，年龄或性别。 我可以在练习场上做同样的事情，但我一直没有更新这些。 这是数据库：
[ { "_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": [] } } ] } ] 这里是请求的后端代码：
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.${req.params.exercise}`] = req.body; users.update({'nickname': req.params.nickname}, updateQuery, (err, result) => { res.send( (err === null) ? { msg: result } : { msg: err } ); }); }); router.delete('/deleteuser/:nickname', (req, res) => { users.remove({ 'nickname': req.params.nickname }, err => { res.send((err === null) ? { msg: '' } : { msg: 'error: ' + err}); }); }); router.delete('/deleteallusers', (req, res) => { users.remove({}, err => { res.send(err === null) ? {msg: '' } : { msg: 'error: ' + err}; }); }); app.listen(3001, () => console.log("Server running at 3001"));
该错误在更新expression式中：
{$set: `info.${req.params.info}`}
这需要是：
const updateQuery = {$set: {}}; updateQuery.$set[`info.${req.params.info}`] = req.params.infoValue; users.update({'nickname': req.params.nickname}, updateQuery, (err, result) => {