Re: Core Data attributes and reserved names...

FROM : Matt Neuburg
DATE : Sat Aug 19 18:47:46 2006

On Fri, 18 Aug 2006 21:55:15 -0600, Greg Stark <<email_removed>> said:
>I learned something unexpected about Core Data and thought I'd share
>it...
>
>As you may know, when graphically creating a data model in Xcode,
>Xcode does a good job of telling you whether an attribute name that
>you want to use is reserved (e.g., if you try to use the attribute
>name "zone", Xcode will let you know you're not allowed to use that
>name).  However, there is at least one reserved name that isn't
>flagged as a problem, and that name is "version".
>
>If you happen to name one of your attributes "version", as I
>unfortunately did, you'll have a lot of fun and excitement tracking
>down why your application is crashing -- especially if you're new to
>Cocoa as I am.
>
>What makes things even more confusing is that when you make the above
>mistake, you can save your Core Data-based document as binary or xml
>store (seemingly without problem, I might add), but you can't save it
>as a SQL store (you'll get [NSCFNumber length]: selector not
>recognized errors...).
>
>Anyway, I hope this note helps others avoid this problem.


Reading the archives would also have helped:

<http://www.cocoabuilder.com/archive/message/cocoa/2005/12/23/153092>

But the failure to call out this information arguably constitutes a bug in
the docs. Please file it! m.

--
matt neuburg, phd = <email_removed>, <http://www.tidbits.com/matt/>
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