gistfile1.m

    // managedObjectModelからFetchedPropertyを検索し、ソート条件を追加
    // NSPersistentStoreCoordinatorを作成する前に行うこと！
    for (NSEntityDescription* entity in [managedObjectModel entities]) {
        for (NSPropertyDescription* property in [entity properties]) {
            if ([property isKindOfClass:[NSFetchedPropertyDescription class]]) {
                NSFetchedPropertyDescription* fetchedProperty = (NSFetchedPropertyDescription*) property;
                NSFetchRequest* fetchRequest = [fetchedProperty fetchRequest];

                if ([[[[fetchRequest entity] propertiesByName] allKeys] containsObject:@"twId"]) {
                    NSSortDescriptor* sortDescriptor = [[[NSSortDescriptor alloc] initWithKey:@"twId" ascending:NO] autorelease];
                    [fetchRequest setSortDescriptors:[NSArray arrayWithObject:sortDescriptor]];
                }
            }
        }
    }