使用'_id'查询5天前的MongoDb记录

Question

I've read online that '_id' holds a timestamp on when it was created and you are able to query it depending on a date. This is what I've I tried so far, but not having any luck.

var d = new Date();
d.setDate(d.getDate() - 5);

collection.find( { }, { metal: 1, change: 1, percent: 1, _id: { $gte: d } } ).toArray(function(err, results) {
    console.log(results);
});

Array in Mongo:

[
    {
        "_id": "58e21b52524c0b0011fb92f4",
        "metal": "Palladium",
        "change": 3,
        "percent": "+0.38%"
    },
    {
        "_id": "58e21ee3524c0b0011fb92f5",
        "metal": "Gold",
        "change": 6,
        "percent": "+0.54%"
    },
    {
        "_id": "58e21ee3524c0b0011fb92f6",
        "metal": "Silver",
        "change": 0,
        "percent": "+0.77%"
    },
...

Much thanks to @robertklep for working through this with me. If anyone else runs into this problem, below is a solution on how to solve it.

Updated Answer:

const ObjectID = require('mongodb').ObjectID;
var d = new Date();
d.setDate(d.getDate() - 1); //1 would be 1day
var _id = ObjectID.createFromTime(d.getTime() / 1000);

collection.find({ _id : { $gte : _id }}, { metal: 1, change: 1, percent: 1 }).toArray(function(err, results) {
  console.log(results);
   ...
});

Answer 1

You need to create an ObjectID from your timestamp, for which you can use ObjectID.createFromTime() :

const ObjectID = require('mongodb').ObjectID;

var d = new Date();
d.setDate(d.getDate() - 5);

var _id = ObjectID.createFromTime(d.getTime() / 1000); // timestamp should be in seconds

After that, you can use _id for comparison queries.