Hi everyone, I was wondering if I could select objects based on a predicate with an array... for example
Code: [NSPredicate predicateWithFormat:@"id=%@", arrayOfID];
Will it work? If no, how can I do it?
Best
A:
Yes, of course you can do it.
Sounds like you need a bit of grounding in Core Data. I found the following tutorial really useful in getting me off the ground with Core Data:
http://iphoneinaction.manning.com/iphone_in_action/2009/08/core-data-part-1-an-introduction.html
pheelicks
2010-03-11 09:34:15
You're right... I wasn't able to find a good tuto for the queries!Thanks
ncohen
2010-03-11 09:45:27
It doesn't seem to work... I get an error:*** -[NSCFArray longLongValue]: unrecognized selector sent to instance 0x7e2d820*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFArray longLongValue]: unrecognized selector sent to instance 0x7e2d820'To be clear... id is an int and my array is an array of int!
ncohen
2010-03-11 10:02:41
It's not clear from what you've posted what the problem is. If the problem is suffieciently different from the current question, perhaps you could ask a new question?
pheelicks
2010-03-11 10:45:52
The error seems to indicate that id is an NSNumber and that hence it tries to send longLongValue to an array because of the `id=%@` predicate. Replacing the = with IN should solve this error because it will send that message to the NSNumbers contained in the array.
Felix
2010-03-11 14:08:00