MongoDB: Only fetch documents created in the last 24hrs?

Question

MongoDB: Only fetch documents created in the last 24hrs?

I want to limit a query I'm making to only look in documents that were created in the past 24 hrs.

What is the best way to structure this query? How do I go about limiting based on date?

node.js
mongodb

Answer 1

If you're not using any other indexes and are using the default ObjectID as your _id, you can do the following:

db.collection.find({
  _id: {
    $gt: ObjectID.createFromTimestamp(Date.now()*1000 - 24*60*60)
  }
}, callback)

Answer 2

For anyone else landing here via google, you can do this in the mongo shell as follows:

db.collection.find({ $where: function () { return Date.now() - this._id.getTimestamp() < (24 * 60 * 60 * 1000)  }  })

Answer 3

first of all it would really help if you will provide people with a schema of your collection.

But just because it already 3 hours passed and no one replied I will try:

Suppose you have you entry and it has a field createdAt which is an ISODate:

{
somefield: "test",
createdAt: ISODate("2012-08-13T04:00:00Z")
}

So what you need to do is to put an index on this field

db.yourColl.ensureIndex({createdAt:1});

Then you get your current time in node.js substitute your 24 hours and get your value of start. (As far as I know there is no analog of NOW in mongdb. Right me someone if I am wrong.)

db.yourColl.find({
   createdAt: {
     $gte: start
   }
});