CoreDataのマイグレーションをしようとしたときのメモ（未解決あり） ref: http://qiita.com/edo_m18/items/717fe32d744a10df7179

auto-migration.m

//自動マイグレーション用にオプションを指定
NSDictionary *options = @{NSInferMappingAutomaticallyOption:@YES,
               NSMigratePersistentStoresAutomaticallyOption:@YES};

_persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error]) {
    //Error!
}

EntityMigrationPolicySample.m

- (BOOL)createDestinationInstancesForSourceInstance:(NSManagedObject *)sInstance entityMapping:(NSEntityMapping *)mapping manager:(NSMigrationManager *)manager error:(NSError **)error
{
    NSManagedObjectContext *context = [manager destinationContext];
    NSString *entityName [mapping destinationEntityName];
    NSManagedObject *dInstance = [NSEntityDescription insertNewObjectForEntityForName:entityName inManagedObjectContext:context];

    [dInstance setValue:@"value1" forKey:@"anyKey1"];
    [dInstance setValue:@"value2" forKey:@"anyKey2"];
    //…

    [dInstance setValue:[sInstance valueForKey:@"existsValue1" forKey:@"existsKey1"];
    [dInstance setValue:[sInstance valueForKey:@"existsValue2" forKey:@"existsKey2"];
    //…

    return YES;
}

file0.m

- (BOOL)createDestinationInstancesForSourceInstance:(NSManagedObject *)sInstance entityMapping:(NSEntityMapping *)mapping manager:(NSMigrationManager *)manager error:(NSError **)error
{
    NSManagedObjectContext *context = [manager destinationContext];
    NSString *entityName [mapping destinationEntityName];
    NSManagedObject *dInstance = [NSEntityDescription insertNewObjectForEntityForName:entityName inManagedObjectContext:context];

    [dInstance setValue:@"value1" forKey:@"anyKey1"];
    [dInstance setValue:@"value2" forKey:@"anyKey2"];
    //…

    [dInstance setValue:[sInstance valueForKey:@"existsValue1" forKey:@"existsKey1"];
    [dInstance setValue:[sInstance valueForKey:@"existsValue2" forKey:@"existsKey2"];
    //…

    return YES;
}

file1.m

//自動マイグレーション用にオプションを指定
NSDictionary *options = @{NSInferMappingAutomaticallyOption:@YES,
               NSMigratePersistentStoresAutomaticallyOption:@YES};

_persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error]) {
    //Error!
}

file2.m

//meta dataを取得する
NSDictionary *sourceMetaData = [NSPersistentStoreCoordinator metadataForPersistentStoreOfType:NSSQLiteStoreType URL:storeURL error:&error];

//コンテキストに適合性を問い合わせる
BOOL isCompatible = [_managedObjectContext isConfiguration:nil compatibleWithStoreMetadata:sourceMetaData];

if (!isCompatible) {
    //マイグレーションが必要
}

MigrationTest.m

//meta dataを取得する
NSDictionary *sourceMetaData = [NSPersistentStoreCoordinator metadataForPersistentStoreOfType:NSSQLiteStoreType URL:storeURL error:&error];

//コンテキストに適合性を問い合わせる
BOOL isCompatible = [_managedObjectContext isConfiguration:nil compatibleWithStoreMetadata:sourceMetaData];

if (!isCompatible) {
    //マイグレーションが必要
}