Why NSFetchedResultsController is not being updated with new data?

Question

My Core Data model has two entities: Author and Book with a To-Many relationship (one author->many books). In the main view I display a list of

Answer 1

Why don't you commit the transactions saving changes?

- (void)saveAuthorName:(NSString *)newName {
    for (Book* book in author.books) {
        [book willChangeValueForKey:@"author"];
    }

    author.name = newName;

    for (Book* book in author.books) {
        [book didChangeValueForKey:@"author"];
    }
    NSError * error ;
    if( ![self.moc save:&error] ) {
         ..... do something ..
    }
}