Hey Mike.

No assertions have ever been fired, which I thought was weird a bit as well. 
BTW, this is on iOS, not Mac OS X if that makes any difference.

-Laurent.
-- 
Laurent Daudelin
AIM/iChat/Skype:LaurentDaudelin                                 
http://www.nemesys-soft.com/
Logiciels Nemesys Software                                      
laur...@nemesys-soft.com

On Feb 16, 2013, at 02:00, Mike Abdullah <cocoa...@mikeabdullah.net> wrote:

> 
> On 16 Feb 2013, at 00:37, Laurent Daudelin <laur...@nemesys-soft.com> wrote:
> 
>> I got a few crash reports from users that have a problem with my CoreData 
>> app.
>> 
>> Given the following code:
>> 
>> /*
>> Returns the persistent store coordinator for the application.
>> If the coordinator doesn't already exist, it is created and the 
>> application's store added to it.
>> */
>> - (NSPersistentStoreCoordinator *)persistentStoreCoordinator
>> {
>>   if (_persistentStoreCoordinator == nil) {
>>       NSURL *storeUrl = [NSURL fileURLWithPath:self.persistentStorePath];
>>       _persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] 
>> initWithManagedObjectModel:[NSManagedObjectModel 
>> mergedModelFromBundles:nil]];
>>       NSError *error = nil;
>>       NSPersistentStore *persistentStore = [_persistentStoreCoordinator 
>> addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl 
>> options:nil error:&error];
>>       NSAssert3(persistentStore != nil, @"%s at %d: Unhandled error adding 
>> persistent store: %@", __FUNCTION__, __LINE__, [error localizedDescription]);
>>              NSLog(@"Created persistent store '%@' at URL %@", 
>> persistentStore, storeUrl);
>>   }
>>   return _persistentStoreCoordinator;
>> }
>> 
>> When the MOC tries to perform a save, an exception is generated:
>> 
>> Exception reason
>> 
>> This NSPersistentStoreCoordinator has no persistent stores. It cannot 
>> perform a save operation.
>> 
>> Stacktrace
>> 
>> PRIMARY THREAD THREAD 0
>> 
>>      • 0 CoreFoundation 0x356212a3 __exceptionPreprocess + 163
>>      • 1 libobjc.A.dylib 0x3393197f objc_exception_throw + 31
>>      • 2 CoreData 0x36f2dfef -[NSPersistentStoreCoordinator 
>> executeRequest:withContext:error:] + 299
>>      • 3 CoreData 0x36f862d3 -[NSManagedObjectContext save:] + 731
>> 
>> How can the persistent store not being existing? 
> 
> Well you whacked in some assertions that failures never happen (generally a 
> bad idea for disk access. It *is* going to fail sometime). Have those 
> assertions fired?
> 

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