Re: Seeking clarification on NSManagedObjectID
Re: Seeking clarification on NSManagedObjectID
- Subject: Re: Seeking clarification on NSManagedObjectID
- From: "I. Savant" <email@hidden>
- Date: Tue, 6 Nov 2007 10:50:02 -0500
> 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.
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