Migrate core data Apps to iCloud

Question

I have an already existing core data apps synchonized by dropbox and I want to migrate on iCloud (with iCloudCoreDataStack). And have 2 devices ( iPhome and iPad) with the same data inside.

I update the ipad apps to the new apps with icloud, everything work fine and synchonisation works.

Migration code :

// check old if old Db exist

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"Livre_de_Cave.sqlite"];

// migrate old persistentStoreCoordinator to icloud and delete it

if ([[NSFileManager defaultManager] fileExistsAtPath:filePath] ) {

    NSLog(@"oldURL");




    NSURL* oldStoreURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:YES error:NULL];
    [oldStoreURL URLByAppendingPathComponent:@"Livre_de_Cave.sqlite"];
    oldStoreURL =[oldStoreURL URLByAppendingPathComponent:@"Livre_de_Cave.sqlite"];


    NSDictionary *options = @{NSMigratePersistentStoresAutomaticallyOption:@YES,
                              NSInferMappingModelAutomaticallyOption:@YES,
                              NSSQLitePragmasOption: @{@"journal_mode": @"DELETE"}
                              };

    NSPersistentStore *store = [self.managedObjectContext.persistentStoreCoordinator  addPersistentStoreWithType:NSSQLiteStoreType

                                                      configuration:nil

                                                                URL:oldStoreURL

                                                            options:options

                                                              error:&error];



 [self.managedObjectContext.persistentStoreCoordinator  migratePersistentStore:store
                                                                         toURL:self.storeURL
                                                                       options:@{ NSPersistentStoreUbiquitousContentNameKey : @"iCloudStore"}
                                                                                  withType:NSSQLiteStoreType
                                                                         error:&error];

    //[store removePersistentStore:store error:&error];
    [[NSFileManager defaultManager] removeItemAtPath:oldStoreURL.path error:&error];


} else {

    NSLog(@"newURL");
    [self.managedObjectContext.persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType
                                                                       configuration:nil
                                                                                 URL:self.storeURL
                                                                             options:@{ NSPersistentStoreUbiquitousContentNameKey : @"iCloudStore" }
                                                                               error:&error];



}

When I update the iphone, all core data entries are duplicates, I under why : I merge and existing store with the icloud store with the same information. If you have and idea to avoid that ...

Thanks

Marcus S. Zarra Marcus S. Zarra · Accepted Answer · 2014-01-10T17:49:19

Wait for the merge to complete (listening for the Core Data notifications) then check the store to see if the data is already in there.

Migrate core data Apps to iCloud

1 Answers