Re: Problem with NSPersistentStore
Re: Problem with NSPersistentStore
- Subject: Re: Problem with NSPersistentStore
- From: Laurent Daudelin <email@hidden>
- Date: Sat, 16 Feb 2013 11:06:42 -0800
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 email@hidden
On Feb 16, 2013, at 02:00, Mike Abdullah <email@hidden> wrote:
>
> On 16 Feb 2013, at 00:37, Laurent Daudelin <email@hidden> 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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