node.js - Mongodb 模式在几秒后清空

Question

当我请求将新对象保存到我的 mongodb 时，它被保存了，几秒钟后该模式中的所有内容都消失了。
在下面的屏幕截图中，您可以看到这种情况，我使用第一个命令检查模式是否为空，然后我请求保存一个成功完成的新对象，几秒钟后您可以看到该对象有消失了。
express 端点如下所示:

router.post('/bookdate',passport.authenticate('jwt', {session:false}), (req, res) => {
const userId = req.user._id
const appartmentNumber = req.user.apartmentNumber;
const requestedDate = req.body.requestedDate;
const bookingZone = req.body.bookingZone;

const newBooking = new Booking({
    'apartmentNumber': appartmentNumber,
    'dateOfBooking': requestedDate,
    'bookingZone': bookingZone
});

if (req.user.hasTimeBooked) {
    res.json({booked: false, msg: 'There is already a booking for this user.'})
} else {
    if (typeof newBooking.requestedDate !== undefined && typeof newBooking.bookingZone !== undefined) {
        Booking.addBooking(newBooking, (err, result)=>{
            if(err){
                res.json({booked: false, msg: err})
            } else {
                res.json({booked: true, msg: result})
            }
        })
    } else {
        res.json({booked: false, msg: 'Undefined parameters Date or Zone'})
    }
}
});

Mongoose 模式看起来像这样

const mongoose = require('mongoose');
const config = require('../config/database');
const BookingSchema = mongoose.Schema({
    apartmentNumber:{
      type: Number,
      unique: true
  },
  dateOfBooking:{
    type: Date
  },
  bookingZone:{
    type: String
  }
});  
const Booking = module.exports = mongoose.model('bookings',BookingSchema, 'bookings');

module.exports.addBooking = function(bookingObj, cb){
  var newBooking = new Booking(bookingObj);
  newBooking.save(cb);
}

控制台中没有出现任何错误，我不太确定从哪里开始查找。提前致谢!

编辑db.bookings.getIndices() 的结果显示在屏幕截图中 here

Answer 1

从 getIndices 输出我可以看到你已经在 dateOfBooking 上创建了一个 TTL 索引，因此它在后端 60 秒后被删除

来自 mongo 文档 TTL index

TTL indexes are special single-field indexes that MongoDB can use to automatically remove documents from a collection after a certain amount of time or at a specific clock time