My application imports into an NSManagedObjectContext created on a
background thread. As the last stage of this import, I save the
background context to the persistent store. All my UI code uses a
managed object context on the main thread, and expects to be notified
via NSManagedObjectContextObjectsDidChangeNotification to update
caches and redisplay.
So... in my background thread I catch the
NSManagedObjectContextDidSaveNotification and pass it to a method
called on the main thread to -
mergeChangesFromContextDidSaveNotification: in the main context. Now I
would expect that all the objects I inserted into the background
context would get inserted into the main context, and I would see
evidence of this in the ObjectsDidChange notification. While the save
notification has @"inserted" and @"updated" sets with the expected
objects, the change notification only contains the updated object in
its @"refreshed" set, and no inserted objects.
Is this what I should expect? Is there a better way I can trigger the
ObjectsDidChange notification on my main context after another context
updates the persistent store? Or, taking things a step back, what's
the best way to keep Core Data fetch request results up-to-date?
thanks,
-natevw
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