如果当前日期>文档日期，如何删除文档

Question

I have the following schema:

Schema = {(
   name: String,
   age: Number,
   email: String,
   date: {
     type: Date
   }
)};

And i am inserting data in my db dinamically throw a form and a post route. After that, i am pulling this data and showing in the html using ejs view engine.

The problem is that i want delete documents who have the date field less than the current date.

I was trying to use TTL , but i don't know exactly how implement, should i use in the schema, or before save the data, in a new entry?

For example, in my post route i have the following code:

var new = new Schema({
   name: req.body.name,
   age: req.body.age,
   email: req.body.email,
   date: {
     type: req.body.date
   }
});

new.save...... 
.... etc

I want delete this document 24 hours after the req.body.date, and no 24 after created...

I'm little confuse, any help is very welcome.

Answer 1

You can achieve this with a TTL collection .

You could set the expireAfterSeconds to 86400 and set the date element to the current date and it should expire after a full day.

The way this would be implemented is that while connected to the server you would issue this command:

db.collection.ensureIndex( { "date.type": 1 }, { expireAfterSeconds: 86400 } )

I don't know how your application sends what data it sends to MongoDB, but you'll want to make sure that it is sending a timestamp corresponding to the midnight before the current time.

For example if it is 1/29/2015 at 2:07:33 PM when the form is sent, the timestamp sent to MongoDB should be 1/29/2015 12:00:00 AM. With the index set above, MongoDB will remove the document at 1/30/2015 at 12:00:00 AM.