コアデータ標準の移行に関するこちらのチュートリアルに従いました。
http://mipostel.com/index.php/home/70-core-data-migration-standard-migration-part-2
そして、複数のパスでそれを行うことについてここに1つ:
複数のパスを使用した Core Data Migration の例または説明は?
結果のコードは次のとおりです。
- (NSManagedObjectContext *)managedObjectContext {
if (managedObjectContext != nil) {
return managedObjectContext;
}
NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
if (coordinator != nil) {
managedObjectContext = [TICDSSynchronizedManagedObjectContext new];
[managedObjectContext setPersistentStoreCoordinator: coordinator];
}
return managedObjectContext;
}
- (NSManagedObjectModel *)managedObjectModel {
if (managedObjectModel != nil) {
return managedObjectModel;
}
// managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain];
NSString *modelPath = [[NSBundle mainBundle] pathForResource:@"EntryDatabase" ofType:@"momd"];
NSURL *modelURL = [NSURL fileURLWithPath:modelPath];
managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
return managedObjectModel;
}
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {
if (persistentStoreCoordinator != nil) {
return persistentStoreCoordinator;
}
NSString *storePath = [[self applicationDocumentsDirectory]
stringByAppendingPathComponent:@"CoreDataStore.sqlite"];
NSFileManager *fileManager = [NSFileManager defaultManager];
// If the expected store doesn't exist, copy the default store.
NSLog(@"file exists at path: %@, %i", storePath, [fileManager fileExistsAtPath:storePath]);
if (![fileManager fileExistsAtPath:storePath]) {
NSString *defaultStorePath = [[NSBundle mainBundle] pathForResource:@"CoreDataStore" ofType:@"sqlite"];
if (defaultStorePath) {
[fileManager copyItemAtPath:defaultStorePath toPath:storePath error:NULL];
}
}
persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
NSURL *storeUrl = [NSURL fileURLWithPath:storePath];
NSError *error;
NSDictionary *pscOptions = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
[NSNumber numberWithBool:NO], NSInferMappingModelAutomaticallyOption,
nil];
if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType
configuration:nil
URL:storeUrl
options:pscOptions
error:&error]) {
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
}
return persistentStoreCoordinator;
}
- (BOOL)checkForMigration
{
BOOL migrationSuccess = NO;
NSString *storeSourcePath = [[self applicationDocumentsDirectory]
stringByAppendingPathComponent:@"CoreDataStoreNew.sqlite"];
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:storeSourcePath]) {
//Version 2 SQL has not been created yet, so the source is still version 1...
storeSourcePath = [[self applicationDocumentsDirectory]
stringByAppendingPathComponent:@"CoreDataStore.sqlite"];
}
NSURL *storeSourceUrl = [NSURL fileURLWithPath: storeSourcePath];
NSError *error = nil;
NSDictionary *sourceMetadata = [NSPersistentStoreCoordinator
metadataForPersistentStoreOfType:NSSQLiteStoreType
URL:storeSourceUrl
error:&error];
if (sourceMetadata) {
NSString *configuration = nil;
NSManagedObjectModel *destinationModel = [self.persistentStoreCoordinator managedObjectModel];
//Our Source 1 is going to be incompatible with the Version 2 Model, our Source 2 won't be...
BOOL pscCompatible = [destinationModel isConfiguration:configuration compatibleWithStoreMetadata:sourceMetadata];
NSLog(@"Is the STORE data COMPATIBLE? %@", (pscCompatible==YES) ?@"YES" :@"NO");
if (pscCompatible == NO) {
migrationSuccess = [self performMigrationWithSourceMetadata:sourceMetadata toDestinationModel:destinationModel];
}
}
else {
NSLog(@"checkForMigration FAIL - No Source Metadata! \nERROR: %@", [error localizedDescription]);
}
return migrationSuccess;
}
- (BOOL)performMigrationWithSourceMetadata :(NSDictionary *)sourceMetadata
toDestinationModel:(NSManagedObjectModel *)destinationModel
{
BOOL migrationSuccess = NO;
//Initialise a Migration Manager...
NSManagedObjectModel *sourceModel = [NSManagedObjectModel mergedModelFromBundles:nil
forStoreMetadata:sourceMetadata];
//Perform the migration...
if (sourceModel) {
NSMigrationManager *standardMigrationManager = [[NSMigrationManager alloc]
initWithSourceModel:sourceModel
destinationModel:destinationModel];
NSArray *mappingModelNames = [NSArray arrayWithObjects:@"StepOne", @"StepTwo", nil];
NSDictionary *sourceStoreOptions = nil;
NSString *destinationStorePath = [[self applicationDocumentsDirectory]
stringByAppendingPathComponent:@"CoreDataStoreNew.sqlite"];
NSURL *destinationStoreURL = [NSURL fileURLWithPath: destinationStorePath];
NSString *destinationStoreType = NSSQLiteStoreType;
NSDictionary *destinationStoreOptions = nil;
for (NSString *mappingModelName in mappingModelNames) {
NSError *error;
NSURL *fileURL = [[NSBundle mainBundle] URLForResource:mappingModelName withExtension:@"cdm"];
NSMappingModel *mappingModel = [[NSMappingModel alloc] initWithContentsOfURL:fileURL];
migrationSuccess = [standardMigrationManager migrateStoreFromURL:destinationStoreURL
type:NSSQLiteStoreType
options:sourceStoreOptions
withMappingModel:mappingModel
toDestinationURL:destinationStoreURL
destinationType:destinationStoreType
destinationOptions:destinationStoreOptions
error:&error];
NSLog(@"Error: %@", error);
}
}
return migrationSuccess;
}
それでも、アプリはメモリ不足になり、次の行でクラッシュしますpersistentStoreCoordinator。
if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType
configuration:nil
URL:storeUrl
options:pscOptions
error:&error]) {