Re: Using an auto incremented NSNumber as attribute in a NSManagedObject

FROM : Joshua Preston
DATE : Thu Mar 06 22:49:26 2008

First, a little head way...

According to some cached documentation (thanks google!) I've located a 
snippet that appears to do exactly what I require, however, there's a 
nice notice saying NOT to use this in a production environment. 
Taking that as a queue, I am assuming that persisting the "nextIndex" 
or "maxIndex" or whatever I call it and incrementing that value is the 
preferred way of handling this task.  Naturally I can't say that I'm a 
huge fan of this method, but I suppose it will work, if only for 
applications with low insertion counts...

If anyone else has a better solution, please feel free :-)

From:http://developer.apple.com/documentation/Cocoa/Conceptual/NSPersistentDocumentTutorial/03_CustomClass/chapter_4_section_4.html

----

The following implementation is crude (and should not be used in a 
production application—the initial tempID reverts to 1 every time the 
application is launched), it serves, however, to quickly illustrate 
the principle.

- (void)awakeFromInsert
{
    static int tempID = 1;

    [super awakeFromInsert];
    self.employeeID = [NSNumber numberWithInt:tempID++];
}
----

As a side note, I think I'm going to cry, it doesn't appear that the 
iPhone SDK is supported on PPC... sniff sniff... Now I'm kind of upset 
that I can't get to the rest of the developer documentation...

Regards,

Joshua Preston
Joshua.<email_removed>

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