Javascript 节点和mongodb中的HTTP put请求

我正在mongoDB和node中尝试向competitionEvent对象添加订阅。 我的问题是我只能写一个订阅，不能一个接一个地添加它们。 这是我的http文件：

const express = require('express')

import * as bodyParser from 'body-parser'
// import { eventApplication } from './compositionRoot'
import { CompetitionModel } from './mongo'

export const app = express()

app.use(bodyParser.json())
// WORKS - find all events
app.get('/events', async (_req: any, res: any) => {
  const comp = await CompetitionModel.find()
  res.send(comp)
})

// WOKRS - find just one event
app.get('/events/:event_id', async (req: any, res: any) => {
  const searchedComp = await CompetitionModel.find(req.params)
  res.send(searchedComp)
})

// WORKS - posts a new comp event
app.post('/new-comp', async (req: any, res: any) => {
  const data = await new CompetitionModel(req.body).save()
  res.json(data)
})

// WORKS - posts a new subscription into a comp
app.put('/update/:event_id', async (req: any, res: any) => {
  const subs = await CompetitionModel.findOneAndUpdate(
    { event_id: req.params.event_id },
    { subscriptions: req.body },
  )
  res.send(subs)
})

// TO TEST - deletes a competition event
app.delete('/delete/:event_id', async (req: any, res: any) => {
  const toDel = await CompetitionModel.deleteOne({
    event_id: req.params.event_id,
  })
  res.json(toDel)
})

这是我的mongo文件：

const mongoose = require('mongoose')

mongoose.connect('mongodb://localhost:27017/CompetitionEvent')

export const CompetitionSchema = new mongoose.Schema({
  event_id: String,
  compName: String,
  place: String,
  time: String,
  subscriptions: [],
  date: Date,
  cost: {
    currency: String,
    amount: Number,
  },
})

export const CompetitionModel = mongoose.model(
  'CompetitionModel',
  CompetitionSchema,
)

export const connection = () =>
  new Promise((resolve, reject) => {
    mongoose.connection.once('open', () => {
      resolve()
    })
    mongoose.connection.once('error', () => {
      reject('oooooh shit')
    })
  })

---

每次我尝试更改它时，它要么不修改competitionEvent，要么不放置任何内容，要么只是用新订阅替换旧订阅，这毫无意义，我相信您会同意

您需要使用

$push

-将新订阅添加到您的竞争中。假设

req.body

持有新订阅，您可以执行以下操作：

app.put('/update/:event_id', async (req: any, res: any) => {
  const subs = await CompetitionModel.findOneAndUpdate(
    { event_id: req.params.event_id },
    { $push: { subscriptions: req.body }},
  )
  res.send(subs)
});

---

首先，修复订阅mongoose的模式。类似下面的模式，以便更好地进行类型转换：

可选

const CompetitionSchema = new mongoose.Schema({
  event_id: String,
  compName: String,
  place: String,
  time: String,
  subscriptions: [{
   //what ever field you wanna add
   _id: false //if you don't wanna use it as a sub-document
}],
  date: Date,
  cost: {
    currency: String,
    amount: Number,
  },
})

然后，在您的

CompetitionEvent

控制器中，使用mongo

$push

操作符在订阅结束时添加事件订阅，或使用mongo

$addToSet

操作符在订阅字段中添加订阅，且不存在任何重复

请记住，

$push

不会检查订阅是否唯一，它只会推送javascript Array.push（）之类的元素。另一方面，

$addToSet

检查订阅是否存在。如果是，则不会添加该订阅。如果否，则将其推送到字段数组

我建议使用

$addToSet

，因为它更安全，不会创建同一订阅的任何副本

代码

app.put('/update/:event_id', async (req: any, res: any) => {
  const subs = await CompetitionModel.findOneAndUpdate(
    { event_id: req.params.event_id },
    { $addToSet: {subscriptions: req.body}},
  )
  res.send(subs)
})