我已经为FreecodeCamp构建了以下项目。
我的项目必须保存用户名和练习以及参加比赛的时间（包括日期）。
我的问题是访问日期的集合数据数组，仅返回日期并在url中执行匹配查询。
这是我返回的JSON代码。我只需要设置一个限制日期，并执行与用户在url中的查询所设置的查询相匹配的查询，以返回与2018-11-22T00:00:00.000Z匹配的日期数量（例如localhost:3000/addme16?id=5_OYzu1QG&start=22 November 2018&end=22 November 2018&limit=2）。因此，如果将查询限制设置为两个日期并返回练习，则仅返回两个与2018-11-22T00：00：00.000Z匹配的日期对象。
{
"_id": "5_OYzu1QG",
"username": "Timmy",
"data": [{
"description": "walking",
"duration": 1,
"date": "2018-11-22T00:00:00.000Z"
},
{
"description": "Reading",
"duration": 2,
"date": "2019-01-01T00:00:00.000Z"
},
{
"description": "Mountain Biking",
"duration": 3,
"date": "2019-01-22T00:00:00.000Z"
}
],
"__v": 0
}
我忘记添加架构和将查询字符串日期更改为iso对象日期的方法。这是我的额外代码信息，这些信息显示了如何向用户数据添加练习。我只想返回与数据库中ISO数据查询日期匹配的日期
//my schema
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const mySchema = new Schema ({
_id:String,
username: String,
data: [{
_id:false,
description : String,
duration: Number,
date :{type:Date}
}]
});
const ExampleClass = mongoose.model('array',mySchema);
module.exports = ExampleClass;
//Save and create new user with id in array collection in mongodb
app.post('/api/exercise/new-user',(req, res)=>{
let myTest = req.body.user.myName;
let testing = /^[a-zA-Z\s]*$/
if(testing.test(myTest) === true && myTest !== ""){
array.find({username:req.body.user.myName})
.then(user => {
if (user.length !== 0) {
return res.send({error:"Name already exists in database"});
}
if(user.length === 0){
myId = shortid.generate();
let data = new array({
username:req.body.user.myName,
_id:myId,
})
data.save(user,err=>{
if(err) throw err;
return res.send({
username:req.body.user.myName,
_id:myId
});
});
}
}).catch(err => {
if(err) throw err;
});
}else{
res.send({username:"Invalid name! Please enter a string of letters for name."})
}
});
//adding exercise to user data
app.post('/api/exercise/add',(req,res)=>{
let myTest = req.body.user.userTask;
const testing = /^[a-zA-Z\s]*$/
const myNum = /^\d+$/;
const space = /^\s+$/;
const checker = /^[0-9-]*$/
let checking = req.body.user.userDuration;
array.countDocuments({_id:req.body.user.userId},(err, count)=>{
if(count>0){
if(testing.test(myTest) === true && myTest !== ""){
if(myNum.test(checking)=== true){
let inPutDate;
let timestamp;
let d;
if(Object.keys(req.body.user.userDate).length === 0){
let date1 = Date.now();
date1 = new Date(date1);
date1.setUTCHours(0,0,0,0);
array.findOneAndUpdate({_id:req.body.user.userId},{ $push :{data:{ description : req.body.user.userTask, duration :Number(req.body.user.userDuration),date:date1}}},{new:true}).then((data)=>{
date1 = new Date(date1).toDateString();
console.log(data)
res.send({
username:data.username,
date:date1,
description:req.body.user.userTask,
duration:Number(req.body.user.userDuration),
_id:req.body.user.userId
})
}).catch(err => {
if(err) throw err;
});
}else{
timestamp = new Date(req.body.user.userDate);
d = moment(timestamp).format("YYYY-MM-DDT00:00:00.000") + "Z";
inPutDate = new Date(d);
let checking = d;
console.log(inPutDate)
console.log(typeof(inPutDate))
array.findOneAndUpdate({_id:req.body.user.userId},{ $push :{data:{ description : req.body.user.userTask, duration :Number(req.body.user.userDuration),date:inPutDate}}},{new:true}).then((data)=>{
inPutDate = new Date(inPutDate).toDateString();
console.log(data)
res.send({
username:data.username,
date:inPutDate,
description:req.body.user.userTask,
duration:Number(req.body.user.userDuration),
_id:req.body.user.userId
})
}).catch(err => {
if(err) throw err;
});
}
}else{
res.send({duration:"Please type a number value"})
}
}else{
res.send({description:"Invalid description! Please enter a string of letters for description."})
}
}else{
res.send({_id:"Please type correct id from datbase"})
}
});
})
<!-- begin snippet: js hide: false console: true babel: false -->
答案 0 :(得分：0)
给出网址字符串：
2018-11-22T00:00:00.000Z (example localhost:3000/addme16?id=5_OYzu1QG&start=22 November 2018&end=22 November 2018&limit=2)
然后提取年，月和日：
const data = db.Collection.find({
date: {
"created_on": {
"$gte": new Date(2018, 11, 22),
"$lt": new Date(2018, 11, 23)
}
}
}).limit(2)
使用$gte（大于等于）和$lt（小于第二天）可确保获得当天的所有时间戳记
答案 1 :(得分：0)
我终于找到了一种设置匹配日期或文档日期限制的方法。我包含以下代码。
app.get('/api/exercise/log',(req,res)=>{
array.findById({_id:req.query.id},(err,data)=>{
let iniate = new Date(req.query.start);
let one = moment(iniate).format("YYYY-MM-DDT00:00:00.000") + "Z";
let date1 = new Date(one);
console.log(date1);
console.log(typeof(date1));
let iniate1 = new Date(req.query.end);
let two = moment(iniate1).format("YYYY-MM-DDT00:00:00.000") + "Z";
let date2 = new Date(two);
console.log(date2)
console.log(typeof(date2))
let myLength;
if(req.query.start === undefined && req.query.end === undefined && req.query.limit === undefined && req.query.id !== undefined){
myLength = data.data.length;
array.aggregate([
{ $match: {_id: req.query.id}}]).then(data =>{
res.send({count:myLength,data})
})
}
else if(req.query.start !== undefined && req.query.end !== undefined && req.query.limit !== undefined && req.query.id !== undefined){
array.aggregate([
{ $match: {_id: req.query.id}},
{ $unwind: '$data'},{$match : {"$and" : [{"data.date" :{$gte : date1} },
{"data.date" :{"$lte" : date2}}]}}]).limit(Number(req.query.limit)).then(data =>{
if(data.length >= Number(req.query.limit)){
res.send(data)
}else{
return res.send({error:"Document do not match limit requested"})
}
})
}
})
})
这最终返回了project的必需参数，这对于完成我的Free Code Camp项目是必需的。使用以下链接[如何使用猫鼬查询集合数组中的数据
how to query data inside an array of the collection using mongoose stackoverflow如何在使用猫鼬收集数组的内部查询数据