When I create a document, save it, then save as, then save as again, it
duplicates the persistent store, so the managed objects I have been using in my
application are all invalidated.
Now there are a whole lot of places in my application where I have KVO set up
on properties of the managed objects, and some places where I have the managed
objects set as instance variables of my objects. I was not expecting them to be
invalidated by the save as operation.
I have created a mini project that reproduces this problem with a simple atomic
store and a data model with one entity.
I presume my KVOs should be OK, since they are looked up at runtime based on
key paths, but the instance variables throughout my application would
presumably all have to be re-fetched.
Anyway, I found that there is a notification that tells you when the objects
are invalidated, so I put the following in my init method of my
NSPersistentDocument subclass:
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(managedObjectsChanged:)
name:NSManagedObjectContextObjectsDidChangeNotification object:[self
managedObjectContext]];
And created a method to refresh my data:
- (void)managedObjectsChanged:(NSNotification *)notification {
if ([[notification userInfo] objectForKey:NSInvalidatedObjectsKey]) {
NSSet *objects = [[notification userInfo]
objectForKey:NSInvalidatedObjectsKey];
for (NSManagedObject *obj in objects) {
[[self managedObjectContext] refreshObject:obj
mergeChanges:YES];
}
} else if ([[notification userInfo]
objectForKey:NSInvalidatedAllObjectsKey]) {
for (NSManagedObject *obj in [[self managedObjectContext]
registeredObjects]) {
[[self managedObjectContext] refreshObject:obj
mergeChanges:YES];
}
}
}
I have confirmed that this is called in the save/save as/save as scenario, with
the NSInvalidatedAllObjectsKey, and my object is getting sent the refreshObject
message...But when I go to access my data, it still tells me that it has been
invalidated. Am I doing something wrong here? The fact that the error is that
the object is invalid rather than trying to message a released object makes me
thing that the actual pointer to the object doesn't change, but that the data
should be reloaded...but it's not. Any clues or suggestions?
Thanks
Gideon
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