平成２６年９月６日

マイグレーション調査

[objc]
//
[newManagedObject setValue:[NSNumber numberWithBool:NO] forKey:@"on_off"];
//
[/objc]

平成２６年９月５日

model変更(on_off追加)

[objc]
– (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
//modelを変更した場合の対処　その①
/*
NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"WeatherForcaster01.sqlite"];
[[NSFileManager defaultManager] removeItemAtURL:storeURL error:nil];

if (_persistentStoreCoordinator != nil) {
return _persistentStoreCoordinator;
}
*/

//model変更無し

NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"WeatherForcaster01.sqlite"];

if (_persistentStoreCoordinator != nil) {
return _persistentStoreCoordinator;
}

NSError *error = nil;
_persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];

//modelを変更した場合の対処　その② 実使用無し
//—————————-
// Check if we already have a persistent store
if ( [[NSFileManager defaultManager] fileExistsAtPath: [storeURL path]] ) {
NSDictionary *existingPersistentStoreMetadata = [NSPersistentStoreCoordinator metadataForPersistentStoreOfType: NSSQLiteStoreType URL: storeURL error: &error];
if ( !existingPersistentStoreMetadata ) {
// Something *really* bad has happened to the persistent store
[NSException raise: NSInternalInconsistencyException format: @"Failed to read metadata for persistent store %@: %@", storeURL, error];
}

if ( ![self.managedObjectModel isConfiguration: nil compatibleWithStoreMetadata: existingPersistentStoreMetadata] ) {
if ( ![[NSFileManager defaultManager] removeItemAtURL: storeURL error: &error] )
NSLog(@"*** Could not delete persistent store, %@", error);
} // else the existing persistent store is compatible with the current model – nice!
} // else no database file yet
//—————————-

if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) {
/*
Replace this implementation with code to handle the error appropriately.

abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.

Typical reasons for an error here include:
* The persistent store is not accessible;
* The schema for the persistent store is incompatible with current managed object model.
Check the error message to determine what the actual problem was.

If the persistent store is not accessible, there is typically something wrong with the file path. Often, a file URL is pointing into the application’s resources directory instead of a writeable directory.

If you encounter schema incompatibility errors during development, you can reduce their frequency by:
* Simply deleting the existing store:
[[NSFileManager defaultManager] removeItemAtURL:storeURL error:nil]

* Performing automatic lightweight migration by passing the following dictionary as the options parameter:
@{NSMigratePersistentStoresAutomaticallyOption:@YES, NSInferMappingModelAutomaticallyOption:@YES}

Lightweight migration will only work for a limited set of schema changes; consult "Core Data Model Versioning and Data Migration Programming Guide" for details.

*/
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}

return _persistentStoreCoordinator;
}
[/objc]