core-data-migration

I have a lot of binary data on Core Data which I would like to remove and save as files so I setup the code so that it would run a manual migration. The problem is that because I have to pull binary from Core Data and save them to files, the migration process could take a very long time depending on how much data there is. I would like to show a simple progress label so that users wouldn't think that the app is frozen. // app did launch - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { ... // add the progress label self.progressLabel

I have what appears to be a bug with Core Data in OS X 10.7.1. My data store (NSSQLiteStoreType) is not being automatically migrated correctly. As a side note the exact same Core Data models are used by an iOS version of the app. -> Here is what appears to be happening. Up until the latest release everything has been working fine -- I have 14 revisions of the model -- model 13 has been shipping for quite some time without incident. Recently I updated my app and added a new model so I am at 14 (this is the version now used in the shipping apps). The iOS version works just fine when migrating

I'm trying to migrate to a new completely different model in my project. The changes are way too much for a lightweight migration and I think the best way is to iterate through the top level objects and set all the attributes and relationships myself. How can I set up the migration process to be completely manual like this. I've looked into NSMigrationManager which seems to require an NSMappingModel. The only examples and tutorials I've seen use inferredMappingModelForSourceModel:destinationModel:error: which I can't use because it isn't able to infer the mapping model. Am I on the right path

Finally got this migration working, it was a big pain. source code Everything works fine in iOS6 but in iOS7 app crash Based on your comment and a bug report at http://openradar.io/15555487 I'm guessing that the full message is something like: CoreData: error: failure reading metadata plist with data bytes: <33> Unable to open database. Error: The file couldn’t be opened because it isn’t in the correct format. Info: { NSUnderlyingException = "An error <null> occurred converting the metadata plist data: <33>"; } Also based on that report, plus your source code: you're almost certainly leaving

I tried to migrate coreData to new version, I'm following this step: Add a new Model Version (Select name.xcdatamodeld then Editor->Add model Version) before making any changes, if you have an app already submitted to App Store which is using the earlier model version. Then, Add a new file from Core Data Tab, as Mapping Model Select, Source Model (Model Version which the submitted App is using) Destination Model (Model Version in which you have done the Changes) source But my data mostly are images and app crash because it takes a lot of memory. So I want to delete old data model and its datas

After adding a new Core Data model version to my app, I performed a lightweight migration, apparently successfully. The migrated file loaded fine, but upon the first attempt to access an attribute via a particular relationship, the app crashes with an NSRangeException: '*** -[__NSArrayM objectAtIndex:]: index 4294967295 beyond bounds [0 .. 35]' . This relationship worked fine prior to the migration. I know from other posts here that 4294967295 is really -1 , but the only thing I can identify with 36 items in my app/data is that there are 36 total entities in the data model (for reference, the

I've created a Core Data project from scratch, the only change I made is that where the persistent coordinator is adding a store, I'm providing a NSPersistentStoreUbiquitousContentNameKey option: coordinator.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: [NSPersistentStoreUbiquitousContentNameKey : "coreDataiCloudTestStore"]) and I'm inserting and saving a new managed object at launch. When at launch there is no iCloud account logged in, no problems. While the app is running, I'm logging into iCloud and going back to the app. I'm getting this error: You