【发布时间】：2022-01-08 18:11:47
【问题描述】：
我正在为教育目的制作一个简单的待办事项列表应用程序，并且我正在使用自定义路由功能，因此如果用户键入自定义路由，我将检查数据库中是否存在具有该名称的文档以及是否存在nt 我正在创建它，但是 mongoose 多次创建同一个文档而不是一个。
我对此一头雾水，您是否在我的代码中看到了可能触发此类问题的内容？
const express = require("express")
const mongoose = require("mongoose");
const app = express()
const _ = require("lodash")
app.set('view engine', 'ejs');
app.use(express.urlencoded({ extended: true}))
app.use(express.static('static'));
app.use('/dep/css', express.static(`${__dirname}/node_modules/bootstrap/dist/css`))
app.use('/dep/js', express.static(`${__dirname}/node_modules/bootstrap/dist/js`))
app.use('/dep/js', express.static(`${__dirname}/node_modules/particlesjs/dist`))
app.use('/dep/js', express.static(`${__dirname}/node_modules/@fortawesome/fontawesome-free/js`))
// --------------------- CONNECTION -----------------------------
mongoose.connect('mongodb://localhost:27017/todoDB');
mongoose.connection.on('connected', function () {
console.log('Mongoose default connection open to 27017');
});
// -------------------------- MODELS AND SCHEMAS -------------------
const itemsSchema = new mongoose.Schema({
task: {
type: String,
required: [true, "Task cannot be empty !"]
}
})
const Item = mongoose.model("Item", itemsSchema);
const listSchema = new mongoose.Schema({
name: {
type: String,
required: [true, "List name cannot be empty !"]
},
items : [itemsSchema]
})
const List = mongoose.model("List", listSchema);
const dateOptions = {
day:"numeric",
weekday:"long",
month : "long",
year : "numeric"
}
const currentDay = new Date().toLocaleDateString("en-US",dateOptions)
// --------------------- GETS ------------------------------------
app.get("/", (req, res) => {
Item.find((err, items) => {
if (err) {
console.log(err);
} else {
res.render('list', {
listName: currentDay,
newItems:items
});
}
})
})
app.get("/:customList", (req, res) => { //GET A REQUEST TO A CUSTOM ROUTE
const customList = _.capitalize(req.params.customList) //GRAB THE CUSTOM ROUTE STRING
List.findOne( {name:customList},(err,listFound) =>{ //SEARCH IF THE DOCUMENT EXISTS
if (err){ console.log(err) }else{
if(listFound){ //IF IT EXISTS RENDER THE VIEW WITH ITS DATA
res.render('list', {
listName: listFound.name,
newItems:listFound.items
});
}else{ //IF ITS NOT THEN CREATE IT WITH THE GIVEN NAME
const list = new List({
name:customList
})
list.save()
res.redirect(`/${customList}`)
console.log("list created !")
}
}
} )
})
// ------------------- POSTS ------------------------------
app.post("/", (req,res) =>{
let item = new Item({
task: req.body.newItem
})
if ( req.body.list === currentDay ){
item.save((err)=>{ err?console.log(err):console.log("saved") })
res.redirect("/")
}else{
List.findOne( {name:req.body.list},(err,listFound) =>{
if (err){ console.log(err) }else{
listFound.items.push(item)
listFound.save()
res.redirect(`/${req.body.list}`)
}
} )
}
} )
app.post("/delete", (req,res) =>{
if ( req.body.list === currentDay ){
Item.findByIdAndRemove({ _id: req.body.checkbox },(err)=>err?console.log(err):console.log("deleted"))
res.redirect("/")
}else{
List.findOneAndUpdate( {name:req.body.list},{ $pull: { items: {_id : req.body.checkbox} } },(err,listFound) =>{
err ? console.log(err) : res.redirect(`/${req.body.list}`)
})
}
})
// -------------------- SERVER --------------------------
const server = app.listen(3000, () => {
console.log(`Todolist app server is running on port ${server.address().port}`);
})
这是我在创建集合后从我的数据库服务器获得的内容，例如在这里我创建了一个名为“yolo”的集合，当我显示我的集合时...：
> db.lists.find()
{ "_id" : ObjectId("61d9d2c74eff3d67c18430f1"), "name" : "Yolo", "items" : [ ], "__v" : 0 }
{ "_id" : ObjectId("61d9d2c74eff3d67c1843100"), "name" : "Yolo", "items" : [ ], "__v" : 0 }
{ "_id" : ObjectId("61d9d2c74eff3d67c18430f4"), "name" : "Yolo", "items" : [ ], "__v" : 0 }
{ "_id" : ObjectId("61d9d2c74eff3d67c18430f7"), "name" : "Yolo", "items" : [ ], "__v" : 0 }
{ "_id" : ObjectId("61d9d2c74eff3d67c18430fa"), "name" : "Yolo", "items" : [ ], "__v" : 0 }
{ "_id" : ObjectId("61d9d2c74eff3d67c18430fd"), "name" : "Yolo", "items" : [ ], "__v" : 0 }
【问题讨论】：
标签： javascript node.js mongodb express mongoose