Migrating iCloud to local persistent store - ios

Question

I am running out of ideas how could I possibly migrate the iCloud store to local store.
From one side I get crash with message:
The specified persistent store was not found
on the other side
NSUnderlyingException = "Can't add the same store twice"
The point is there is no clear tutorial how to migrate stores (Or at least I can't find). Everything I found so far was pieces of information spread across net and couldn't make very much sense.
This is my code:
- (NSPersistentStoreCoordinator *) cloudPersistentStoreCoordinator {
self.storeURL = [[MMNUtilities localDocumentsURL] URLByAppendingPathComponent:#"myapp.sqlite"];
NSPersistentStoreCoordinator *persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:self.managedObjectModel];
NSDictionary *storeOptions = #{NSPersistentStoreUbiquitousContentNameKey: #"myapp"};
NSError *error = nil;
self.persistentStore = [persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType
configuration:nil
URL:self.storeURL
options:storeOptions
error:&error];
if (error) {
NSLog(#"Unresolved error %#, %#", error, [error userInfo]);
abort();
}
return persistentStoreCoordinator;
}
- (BOOL) didMigrateiCloudStoreToLocalStore {
NSError *error = nil;
self.persistentStoreCoordinator = [self cloudPersistentStoreCoordinator];
NSDictionary *storeOptions = #{NSPersistentStoreUbiquitousContentNameKey: #"myapp",
NSPersistentStoreRemoveUbiquitousMetadataOption : #YES};
NSPersistentStore *localStore = [self.persistentStoreCoordinator migratePersistentStore:self.persistentStore <<< Exception happens here
toURL:self.storeURL
options:storeOptions
withType:NSSQLiteStoreType
error:&error];
if (error) {
NSLog(#"Error: %#", error.description);
[[NSNotificationCenter defaultCenter] postNotificationName:HnHCoreDataPersistentStoreMigrationFailed object:self];
return NO;
}
return [self reloadStore:localStore];
}
I got following message in console:
CoreData: error: -addPersistentStoreWithType:SQLite configuration:PF_DEFAULT_CONFIGURATION_NAME URL:file:///var/mobile/Containers/Data/Application/EFC750F6-D10E-4B8A-9F83-C77621218DB7/Documents/myapp.sqlite options:{
NSPersistentStoreRemoveUbiquitousMetadataOption = 1;
NSPersistentStoreUbiquitousContentNameKey = myapp;
"_NSNotifyObserversOfStoreChange" = 0;
} ... returned error Error Domain=NSCocoaErrorDomain Code=134080 "The operation couldn’t be completed. (Cocoa error 134080.)" UserInfo=0x15deee80 {NSUnderlyingException=Can't add the same store twice} with userInfo dictionary {
NSUnderlyingException = "Can't add the same store twice";
}
Any help will be appreciated.

Answer 1

You need to create a new local store with a different name.