How to make FindOne with a selection of specific fields using the driver's office?

Question

MongoDB

I want something like this:

var user bson.M
users.FindOne(ctx, bson.M{"username": "some"}).SetProjection(bson.M{"username": 1}).Decode(&user)

Answer 1

use the appropriate structure:

type usernameOnly struct {
  username string`bson:"username"`
}
var user usernameOnly
users...Decode(&user)