Re: Unique items in Core Data models
Re: Unique items in Core Data models
- Subject: Re: Unique items in Core Data models
- From: Diederik Hoogenboom <email@hidden>
- Date: Wed, 16 May 2007 20:12:43 +0200
One possible solution is to add a uuid attribute to your entity then
have the following code in your awakeFrominsert:
CFUUIDRef UUID = CFUUIDCreate(kCFAllocatorDefault);
CFStringRef UUIDString = CFUUIDCreateString(kCFAllocatorDefault,UUID);
[self setValue:(NSString *)UUIDString forKey:@"uuid"];
CFRelease(UUID);
CFRelease(UUIDString);
This will generate a unique string to identify your managed object.
- Diederik
--
Diederik Hoogenboom
Obvious Matter
http://www.obviousmatter.com
On 15-mei-2007, at 3:38, Keith Penrod wrote:
Is there a way to set it up so that one of the attributes for an
Entity is a sort of identifier--that is, every Book has a title and
only one book can exist for any given title--kind of like a
NSDictionary? So, if the user tries to create a new item and name
it the same title it will either ignore the request, combine the
info for the two books, or raise an error message.
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