Using embedded documents to avoid orphans

In a similar manner, as discussed earlier in this chapter, instead of using DBRefs, or unique keys to reference documents across collections, you can simply embed the entire document, or a subset of that document, where the information is needed. Going back to the Book Someplace, Inc. scenario as an example, a Booking document includes fragments of both Customer and Property. To refresh your memory, have a look at the Booking, CustBooking, and PropBooking document structures:

Booking = {
    "bookingKey"   : <string>,
    "customer"     : <CustBooking>,
    "property"     : <PropBooking>,
    "bookingInfo"  : <BookingInfo>,
    "rooms"        : [<RoomBooking>,<RoomBooking>,etc.],
    "totalPrice"   : <float>
}
CustBooking = {
    "customerKey"     : <string>,
    "customerName"    : <Name>,
    "customerAddr"   ...