How to select a single field for all documents in a MongoDB collection?

Question

In my MongoDB, I have a student collection with 10 records having fields name and roll. One record of this collection is:

{
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Answer 1

_id = "123321"; _user = await likes.find({liker_id: _id},{liked_id:"$liked_id"}); ; let suppose you have liker_id and liked_id field in the document so by putting "$liked_id" it will return _id and liked_id only.