re: NSManagedObject custom class & for loop
re: NSManagedObject custom class & for loop
- Subject: re: NSManagedObject custom class & for loop
- From: "HAMILTON, Steven" <email@hidden>
- Date: Wed, 1 Oct 2008 09:09:49 +1000
- Acceptlanguage: en-US, en-AU
- 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:@"email@hiddent"] 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
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