iPhone coredata fetch request, basics around relationships and sections

Answer 1

If you want to fetch and section ListItems, then you should be using "ListItem" as your entity for the fetch.

In this case, there is a way to say "fetch all ListItem objects Where List = 'xxxxx'", it's called a predicate (NSPredicate).

Try something like this (where "list" is the name of the ListItem relationship with List):

NSPredicate *pred = [NSPredicate predicateWithFormat:@"list == %@", listObject];
[fetchRequest setPredicate:pred];

Also, see the Predicate Programming Guide.