Update Document - $position

$position is a $push modifier.

Function Build

Build a $position fragment with the Position function from the update package.

// bson.D{bson.E{Key:"$position", Value:0}}
position := update.Position(0)

Method Build (Builder)

$position is usually placed in the same bson.D as $each, then passed as the value of $push.

// bson.D{bson.E{Key:"$push", Value:bson.D{bson.E{Key:"tags", Value:bsonx.NewD().Add("$each", []string{"go", "mongodb"}).Add("$position", 0).Build()}}}}
update.NewBuilder().
    Push("tags", bsonx.NewD().
        Add("$each", []string{"go", "mongodb"}).
        Add("$position", 0).
        Build()).
    Build()