How to return popped element in mongodb

Question

I would like to put one element from an array and get this element.

Is this possible in mongodb?

I did not find such information in

http://docs.mongodb.org/manual/reference/operator/pop/

Answer 1

It's impossible. MongoDB does not return any part of the document that you previously used with regular updating, nor can it return the full document, and not just this pop-up element to findAndModify ( http://docs.mongodb.org/manual/reference/command/ findAndModify / ), you can filter this element both the first and the last.

NB: I have to warn that findAndModify is basically like collecting each document in a query and working with it, how it can return it so you can see some performance loss on queries that span a large numeric number.

Answer 2

MongoDB operations return full documents .

Parameters can be:

• Use the findAndModify command and get the pop-up value of the side of the array program by processing the returned document. (1 request)
• use find to get the document, get the value you want to set on the program side, and send update . (2 requests)