Re: Unique data in Core Data?

FROM : Paul Collins
DATE : Wed Jun 21 18:57:45 2006

On Jun 21, 2006, at 8:38 AM, Andrew Kinnie wrote:

> I am curious whether there is a quick and easy way to create unique 
> data in a Core Data app.


If you're looking for something like the "unique" flag in MySQL, I'm 
not aware of any equivalent in Core Data. But there is a validation 
system you can put your own methods in, so you can programmatically 
ensure the uniqueness of new entries. Best thing I can think of is to 
fetch with the new string and see if it exists. Read the "Validation" 
section of Core Data Programming Guide.

FYI, for a serialized attribute (1, 2, 3, ...) I keep a separate, 1-
entry table with integer attributes like "nextID" with the next 
serial number to use for that persistence stack.

Paul Collins