lookup
fun <FROM : Any> lookup(from: MongoCollection<FROM>, localField: KProperty1<out Any, Any?>, foreignField: KProperty1<FROM, Any?>, newAs: KProperty1<out Any, Any?>): Bson
Creates a $lookup pipeline stage for the specified filter (Typesafe version)
Return
the $lookup pipeline stage
Parameters
from
the collection in the same database to perform the join with.
localField
specifies the field from the local collection to match values against.
foreignField
specifies the field in the from collection to match values against.
newAs
the name of the new array field to add to the input documents.