_id comparison in MongoDB

Question

NoSQL

Hello!
Some data is inserted into the collection. For example messages:

{
"from": num,
"to":num,
"msg", string
}

How to correctly display the 10 most recent messages?
Knowing the id of any message, is it possible to display "10 messages, before the message with _id"?
Thank you!

Answer 1

From the current object, you can get the creation time with:
Next, you can make a selection with the following construction:
True, I don’t remember how indexes behave with such queries, because I always prefer to store unixtime as a separate field.