SectionNameKeyPath cannot be transient?

[inPhilly]

I believe this is supposed to be a drop-in replacement for NSFetchedResultsController. NSFetchedResultsController allows a transient (non-persisted) property for sectionNameKeyPath. This is a very important aspect of NSFetchedResultsController. There are many times where sectionNameKeyPath is better not to be a persistedProperty. For example, we may sort the data by NSDate. Say there are 10 objects and each has a different date but is within the same month. SectionNameKeyPath would be a way that we could keep the sort order (date) yet not group the items by date, but by a broader grouping such as month or year. This is just one example; I have 10s of cases in my app where sectionNameKeyPath needs to be a transient (non-persisted) property. I simply cannot create an additional field each time I need a non-persisted sectionNameKeyPath. Since this is a drop-in for NSFetchedResultsController, which does offer that functionality, is this something that could possibly change for RBQFetchedResultsController? Is it on the roadmap at all, if this is still being updated?

[malhal]

NSFetchedResultsController may work with a transient property as sectionNameKeyPath but you will soon discover why you shouldn’t. Every object in the fetch result gets faulted just to find out its section!