On 12/20/09 3:19 PM, Gerriet M. Denkmann said:
>What I try to accomplish:
>SomeEntity has a property called "uniqueKey" and this is (no big
>surprise) meant to be unique.
>
>When the "UniqueKey" column in my table view gets edited,
>validateUniqueKey:error: gets called, I check the new value for
>uniqueness and all is fine.
>
>But hitting the "+" button several times inserts several objects with
>the same key (Default Value).
As others have said, you probably want awakeFromInsert.
Depending what kind of 'unique' value you want, you could create a
unique string like this:
CFUUIDRef uuid = CFUUIDCreate (kCFAllocatorDefault);
if (uuid)
{
uuidStr = NSMakeCollectable (CFUUIDCreateString
(kCFAllocatorDefault,
uuid));
CFRelease (uuid);
}
If you want/need to compare to other objects of the same entity type,
then be warned that performing a fetch within awakeFromInsert is
probably not a good idea. NSArrayController doesn't like it when you do that.
--
____________________________________________________________
Sean McBride, B. Eng s...@rogue-research.com
Rogue Research www.rogue-research.com
Mac Software Developer Montréal, Québec, Canada
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