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Problem while taking the Low-level Core Data Tutorial

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Problem while taking the Low-level Core Data Tutorial

Subject: Problem while taking the Low-level Core Data Tutorial
From: email@hidden <email@hidden>
Date: Tue, 4 Dec 2007 22:01:49 +0100

Hi all,

I'm quite new at programming with Cocoa and I'm taking some tutorials before starting a project of my own.

So I started the "Low-level Core Data Tutorial". Everything fine until chapter 6. I can build and run the code I wrote at chapter 6. It compiles without warnings. When I run it, it does not log any error, except that it enters in some loop and get stuck there.

When I monitor the process I can see that the memory used keep growing until I eventually kill the process. The new file is created in the correct directory but remains empty.

The debugger shows that the program enters the code:

[ moc save: &error]

And never exits from there. ( This is the kind of things I can have on the debugger):

#0 0xfffeff00 in objc_msgSend_rtp #1 0x92c20c9c in -[NSNumber compare:] #2 0x92d4ca94 in -[NSComparisonPredicateOperator performPrimitiveOperationUsingObject:andObject:] #3 0x92d4eb00 in -[NSPredicateOperator performOperationUsingObject:andObject:] #4 0x92d4adec in -[NSComparisonPredicate evaluateWithObject:variableBindings:] #5 0x92d4c360 in -[NSPredicate evaluateWithObject:] #6 0x9415b758 in -[NSManagedObject validateValue:forKey:error:] #7 0x9415b460 in -[NSManagedObject(_NSInternalMethods) _validateEnumeratedProperties:forPropertyType:error:] #8 0x9415b324 in -[NSManagedObject(_NSInternalMethods) _validateForSave:] #9 0x94173060 in -[NSManagedObject validateForInsert:] #10 0x94173ef8 in -[NSManagedObject(_NSInternalMethods) _validateForInsert:] #11 0x9415af08 in -[NSManagedObjectContext(_NSInternalAdditions) _validateObjects:forOperation:error:exhaustive:forSave:] #12 0x9415acd0 in -[NSManagedObjectContext(_NSInternalAdditions) _validateChangesForSave:] #13 0x9415ab94 in -[NSManagedObjectContext (_NSInternalChangeProcessing) _prepareForPushChanges:] #14 0x9415a5e4 in -[NSManagedObjectContext save:] #15 0x00024d00 in main at CDCLI.m:41


I checked my code for typos and corrected some but it didn't help.

I guess there is still something wrong in my code but I don't know what to check. I am really trying to follow the tutorial.

Thanks for any suggestion.

David

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