NSFetchRequest setFetchOffset in NSFetchedResultsController

Question

I'd like to know if I should expect setFetchOffset to work in an NSFetchedResultsController.

Given a UITableView that displays rows like this from an NSFRC:
1
2
3
4
5

I expected that adding this line:

[fetchRequest setFetchOffset:1];

e.g. line 207 here: http://github.com/mandersen/FetchOffsetCase/blob/master/Classes/RootViewController.m

Would result in UITableView rows like:
2
3
4
5

But it doesn't change the values displayed in the table.

Answer 1

setFetchOffset only works on persisted entities.

I figured this out while experiencing similar frustrations with NSFetchRequest setReturnsDistinctResults and found Michael Waterfall's question on that subject:

NSDictionaryResultType expression not taking into account newly inserted objects