db.collection.remove()函数在使用Node.js的MongoDB上不起作用

Question

我刚刚有一个关于使用Node.js使用MongoDB遇到的问题的快速问题。我无法使用命令"db.users.remove(｛｝("删除集合中的所有文档。我知道集合名称是正确的。我已经在终端中运行了这个命令，尽管看起来命令是运行的，但它并没有删除集合中的所有文档。当我使用post请求运行它时，它只是说数据库没有定义，这对我来说毫无意义。我没有查询字符串的原因是我想删除所有文档。我已经在下面包含了我的所有代码，但如果有人能告诉我删除集合中所有文档的更好方法或解决我问题的方法，我将不胜感激。谢谢！

const fs = require('fs')
const express = require('express')
const router = express.Router()
const checkTypes = require('checktypes-js')
const schema = require('../schemas/user')
const usersDB = require('../models/usersModel')
const { Types } = require('mongoose')
const fileQuery = "logs.txt"

router.post('/new', (req, res) => {
checkTypes(req.body, schema.user, async (err, passedObject) => {
if (err){
console.log(err)
return res.json({errors: err})
} else {
const existingUserEmail = await usersDB.findOne({email: passedObject.email})
const existingUserUsername = await usersDB.findOne({username: passedObject.username})
console.log(existingUserEmail, existingUserUsername)
if (existingUserEmail || existingUserUsername){
return res.json({error: "A user with that email or username exists too!"})
}
passedObject.active = true
const addedUser = await usersDB.create(passedObject)
res.send(addedUser)
const fileMessage = "nNew user with username of " + existingUserUsername + ' has been added on ' + new Date()
console.log(fileMessage)
return fs.appendFile(fileQuery, fileMessage, function (err){
if (err){
console.error(err)
}
res.send("The file has been successfully written to!")
})
} 
})
})
router.post('/update', (req, res) => {
checkTypes(req.body, schema.user, async (err, passedObject) => {
if (err){
console.log(err)
return res.json({errors: err})
} else {
const {_id, ...update} = passedObject
if(!Types.ObjectId.isValid(_id)){
return res.json({error: 'Invalid id supplied'})
}
const updatedUser = await usersDB.findByIdAndUpdate(_id, update, {new: true})
if (!updatedUser){
return res.json({error: "Could not find the user with that ID!"})
} else {
res.json(updatedUser)
const fileMessage = "nUpdate user with id of " + _id + ' on ' + new Date()
console.log(fileMessage)
return fs.appendFile(fileQuery, fileMessage, function (err){
if (err){
console.error(err)
}
res.send("The file has been successfully written to!")
})
}
}
})
})
router.post("/delete", (req, res) => {
checkTypes(req.body, schema.user, async (err, passedObject) => {
if (err){
console.log(err)
res.json({error: err})
} else {
const {_id, ...deleteObj} = passedObject
console.log(_id)
if(!Types.ObjectId.isValid(_id)){
return res.json({error: 'Invalid id supplied'})
}
const deleteUser = usersDB.findByIdAndRemove({_id: _id}, function (err){
if (err){
return res.send("A user with that ID is not defined!")
} else {
res.send("The object has been deleted!")
const fileMessage = "nUser with id of " + _id + ' has been delete on ' + new Date()
console.log(fileMessage)
return fs.appendFile(fileQuery, fileMessage, function (err){
if (err){
console.error(err)
}
res.send("The file has been successfully written to!")
})
}
})
}
})
})
router.post("/deleteAll", (req, res) => {
db.users.remove({})
res.send("All documents have been deleted!")
const fileMessage = "nAll documents in the remindars collection have been deleted on " + new Date()
console.log(fileMessage)
return fs.appendFile(fileQuery, fileMessage, function (err){
if (err){
console.error(err)
}
res.send("The file has been successfully written to!")
})
})
router.post('/testFile', (req, res) => {
const fileMessage = "nThe file writing script was tested on " + new Date()
console.log(fileMessage)
return fs.appendFile(fileQuery, fileMessage, function (err){
if (err){
console.error(err)
}
res.send("The file has been successfully written to!")
})
})
router.post('/clearFile', (req, res) => {
const fileMessage = ""
console.log(fileMessage)
return fs.writeFile(fileQuery, fileMessage, function (err){
if (err){
console.error(err)
}
res.send("The file has been successfully written to!")
})
})
module.exports = router

Answer 1

您有：

const usersDB = require('../models/usersModel')

这是你的猫鼬模型，但你在叫db.users.remove({})。

像代码中的其他地方一样使用您的模型：

const result = await usersDB.remove({}).exec()

或：

Author.remove({}).then(x => {
console.log(x)
})