Re: Seeking clarification on NSManagedObjectID

FROM : I. Savant
DATE : Tue Nov 06 16:50:02 2007

> After reviewing the Core Data documentation the following is not clear
> to me: If a managed object is deleted, is there a chance that its
> object ID will be subsequently reused?


http://developer.apple.com/documentation/Cocoa/Conceptual/CoreData/index.html#//apple_ref/doc/uid/TP40001075

"An NSManagedObjectID object is a universal identifier for a managed
object, and provides basis for uniquing in the Core Data Framework. A
managed object ID uniquely identifies the same managed object both
between managed object contexts in a single application, and in
multiple applications (as in distributed systems). Like the primary
key in the database, an identifier contains the information needed to
exactly describe an object in a persistent store ..."

  With wording like "the basis for uniquing", and "like the primary
key in the database", I take this to mean an ID is never reused.
Further, I believe they use UUIDs so it's unlikely you'd ever be
*able* to get the same ID generated for a managed object.

--
I.S.