Crash When Saving On Device After Changing Datamodel - iphone

Question

I've been hunting for a solution for the last four hours and I am posting in desperation. My app was working perfectly on the simulator, my iPhone, and my ipad until I added an attribute to one of my Data Models.
My iPhone application uses Core Data and iCloud. In the AppDelegate, I create the managedObjectModel by merging two models. Everything seems fine until I try to save the ManagedObjectContext. That's when it crashes with:
* Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'This
NSPersistentStoreCoordinator has no persistent stores. It cannot
perform a save operation.'
This does not happen on the simulator.
I have tried:
Project->Clean Build Folder
Project->Clean
Deleting the app from my
device
Deleting the iCloud data from my iCloud back up
reboot computer
changed the ".momd" to ".mom" and back again (read about it in another question)
Thanks for the help.
EDIT to add code:
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {
if (__persistentStoreCoordinator != nil) {
return __persistentStoreCoordinator;
}
__persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]];
NSPersistentStoreCoordinator *psc = __persistentStoreCoordinator;
// TODO: Set up iCloud in another thread:
//dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSString *dataFileName = [NSString stringWithFormat:#"%#.sqlite", APP_TITLE_NO_SPACES];
NSString *iCloudDataDirectoryName = #"Data.nosync";
NSString *iCloudLogsDirectoryName = #"Logs";
NSFileManager *fileManager = [NSFileManager defaultManager];
NSURL *localStore = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:dataFileName];
NSURL *iCloud = [fileManager URLForUbiquityContainerIdentifier:nil];
if (iCloud) {
NSURL *iCloudLogsPath = [NSURL fileURLWithPath:[[iCloud path] stringByAppendingPathComponent:iCloudLogsDirectoryName]];
if([fileManager fileExistsAtPath:[[iCloud path] stringByAppendingPathComponent:iCloudDataDirectoryName]] == NO) {
NSError *fileSystemError;
[fileManager createDirectoryAtPath:[[iCloud path] stringByAppendingPathComponent:iCloudDataDirectoryName]
withIntermediateDirectories:YES
attributes:nil
error:&fileSystemError];
if(fileSystemError != nil) {
NSLog(#"Error creating database directory %#", fileSystemError);
}
}
NSString *iCloudData = [[[iCloud path]
stringByAppendingPathComponent:iCloudDataDirectoryName]
stringByAppendingPathComponent:dataFileName];
NSLog(#"iCloudData = %#", iCloudData);
NSDictionary* options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
[NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption,
CLOUD_CONTAINER_IDENTIFIER, NSPersistentStoreUbiquitousContentNameKey,
iCloudLogsPath, NSPersistentStoreUbiquitousContentURLKey, nil];
[psc lock];
[psc addPersistentStoreWithType:NSSQLiteStoreType
configuration:nil
URL:[NSURL fileURLWithPath:iCloudData]
options:options
error:nil];
[psc unlock];
} else {
NSLog(#"iCloud is NOT working - using a local store");
NSMutableDictionary *options = [NSMutableDictionary dictionary];
[options setObject:[NSNumber numberWithBool:YES] forKey:NSMigratePersistentStoresAutomaticallyOption];
[options setObject:[NSNumber numberWithBool:YES] forKey:NSInferMappingModelAutomaticallyOption];
[psc lock];
[psc addPersistentStoreWithType:NSSQLiteStoreType
configuration:nil
URL:localStore
options:options
error:nil];
[psc unlock];
}
__persistentStoreCoordinator = psc;
[[NSNotificationCenter defaultCenter] postNotificationName:NOTIFICATION_ICLOUD_SOMETHING_CHANGED object:nil];
return __persistentStoreCoordinator;
}

Answer 1

Usually, it should okay after you deleted the program data. However, error indicates, that you do not have an inconsistency but simply no store at all. Assumption: you do not re-initiate it in case of a fault. Maybe, the following code can be useful:
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
if (__persistentStoreCoordinator != nil) {
return __persistentStoreCoordinator;
}
NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:#"myApp.sqlite"];
NSError *error = nil;
__persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
if (![__persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) {
// Error, erase data
[[NSFileManager defaultManager] removeItemAtURL:storeURL error:nil];
NSLog(#"store cleaned");
__persistentStoreCoordinator = nil;
return [self persistentStoreCoordinator];
}
return __persistentStoreCoordinator;
}