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problem debugging Core Data
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problem debugging Core Data


  • Subject: problem debugging Core Data
  • From: "Xavi CaballĂ©" <email@hidden>
  • Date: Wed, 28 Jun 2006 17:54:29 +0200

Hello,

I am trying to debug an app that uses Core Data. I've set the Core
Data debug level to 3 (using the -com.apple.CoreData.SQLDebug argument
when launching the app). The problem is that the app raises an
exception when starting, and looking at the stack, I think it's a
problem with the the code that logs Core Data's debug info. Here are
the relevant entries in the stack:

#0	0x9080b0a1 in _CFStringAppendFormatAndArgumentsAux
#1	0x90809c8c in _CFStringCreateWithFormatAndArgumentsAux
#2	0x92741888 in NSLogv
#3	0x9277f0b4 in NSLog
#4	0x93e1a401 in -[NSSQLCore _newRowsForSelector:withArgument:andLimit:]
#5	0x93de004b in -[NSSQLCore newRowsForFetchRequest:]
#6	0x93ddfcfa in -[NSSQLCore objectsForFetchRequest:inContext:]
#7	0x93dd244e in -[NSPersistentStoreCoordinator(_NSInternalMethods)
executeRequest:withContext:]
#8	0x93dd1729 in -[NSManagedObjectContext executeFetchRequest:error:]
#9	0x000322a6 in -[LocalLibraryManager fetchAllTracksUsingMoc:] at
LocalLibraryManager.m:597
...


The code that sends the message executeFetchRequest:error: is this:

NSError *error = nil;
NSEntityDescription *entityDescription = [NSEntityDescription
entityForName:@"Track" inManagedObjectContext:moc];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
[request setEntity:entityDescription];
NSArray *result = [moc executeFetchRequest:request error:&error];
...

I guess that Apple's code is confused with some string which contains
a percent sign that's not meant to be parsed as a formatting character
but as a literal. But even if that's the problem, I don't know how to
avoid it.

All works OK if I set the debug level to 2, but I need more info to
debug the problem I was originally working on, so I would like to be
able to use level 3.

I would really appreciate any idea about how to solve this.
Thanks in advance.

xavi
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