On 16 Feb 2013, at 00:37, Laurent Daudelin <[email protected]> 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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