site_archiver@lists.apple.com Delivered-To: cocoa-dev@lists.apple.com Thread-index: AckjUaLnRpNyVdgsSAWUk1BdPW6gig== Thread-topic: NSManagedObject custom class & for loop Great stuff. Thanks a lot, that works a treat. Feed: Cocoa mail archive Posted on: Monday, 29 September 2008 8:22 PM Author: Steven Hamilton Subject: NSManagedObject custom class & for loop
The problem is when the code hits the for (transaction in transactions) loop it dumps to GDB with an obj_msgsend error and I can't see why. Am I trying to do something that a custom class shouldn't be able to do? If I comment out the loop it runs fine.
In the first line of your loop you're sending the -amount message to the entity, not the transaction object. That line should probably read NSNumber *amount = [transaction amount] A few other things though, with more than a few transactions this will be really slow. You could request the sum of the transaction amounts directly from CoreData and it could handle them much quicker. Something like [account valueForKeyPath:@"transactions.@sum.amount"] assuming you've set up a "transactions" relationship. If you don't have a relationship you could still perform your fetch and issue a similar message to the transactions array you get here, [transactions valueForKeyPath:@"@sum.amount"] If, for some reason, you still need to iterate over all of the objects individually, I'd recommend that you don't convert your final balance to an NSNumber until you're finished with your loop. Ashley Clark ________________________________ This e-mail is sent by Suncorp-Metway Limited ABN 66 010 831 722 or one of its related entities "Suncorp". Suncorp may be contacted at Level 18, 36 Wickham Terrace, Brisbane or on 13 11 55 or at suncorp.com.au. The content of this e-mail is the view of the sender or stated author and does not necessarily reflect the view of Suncorp. The content, including attachments, is a confidential communication between Suncorp and the intended recipient. If you are not the intended recipient, any use, interference with, disclosure or copying of this e-mail, including attachments, is unauthorised and expressly prohibited. If you have received this e-mail in error please contact the sender immediately and delete the e-mail and any attachments from your system. If this e-mail constitutes a commercial message of a type that you no longer wish to receive please reply to this e-mail by typing Unsubscribe in the subject line. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/site_archiver%40lists.apple... This email sent to site_archiver@lists.apple.com