Question

When an managed object is fetched, and the staleness interval is set to 5 minutes, what happens after 10 minutes, when I access an property of that object?

Would Core Data then perform a fresh fetch request? Does that make sense? I can’t think of a situation where data is already cached but the object is a fault. When can this happen?

Answer 1

From Core Data Programming Guide: Using Managed Objects

Note that an object’s staleness
interval is the time that has to pass
until the store re-fetches the
snapshot. This therefore only affects
firing faults—moreover it is only
relevant for SQLite stores (the other
stores never re-fetch because the
entire data set is kept in memory).

It only affects full fledged objects — it does not affect those that are faults (ie “ghost objects” with no populated attributes.)

You really only need to fiddle with this in a complex setup where you have multiple context all changing the store simultaneously. On iOS apps, this is rarely necessary.