I have an NSManagedObject "masterObject" in my main context with an
NSOrderedSet property on it "characterLists". I'm observing that property in a
UITableView and making the necessary changes when things are inserted, deleted
etc. This has worked fine up until now. I just wrote a data importer which
takes the contents of a file and adds it to the database, potentially adding
one or more objects to the characterLists property.
For ease of isolation I make a new MOC, parent it to the MOC masterObject is
in, and then load masterObject into it using its object ID like this
NSManagedObjectContext *moc = [ [ NSManagedObjectContext alloc ]
initWithConcurrencyType:NSMainQueueConcurrencyType ];
moc.parentContext = database.managedObjectContext;
RKCHDBMasterObject *masterObject = database.masterObject;
RKCHDBMasterObject *mocMasterObject = (RKCHDBMasterObject*)[ moc
objectWithID:masterObject.objectID ];
Then I do all my adds in the child context, moc, and add any new characterLists
to the mocMasterObject. If the file parses correctly, I save the child context,
else I just toss it away and put up an appropriate error message, the line of
code for that is
NSError *saveError = nil;
if( [ moc save:&saveError ] ) // <---- HERE
[ database saveContext ];
In the case where my file parse causes me to add to 'characterLists', adding
just one object, I'm getting *two* KVO insert notifications on the original
master object telling me the same object was inserted both times. They are
exactly the same call and both of them are in the line highlighted, when saving
the child context, it's not even one on the child and one on the master save.
It's the same KVO notification, same index set, same type and the 'inserted'
object is exactly the same as well, same address, everything.
This of course breaks the world because I add a row in my tableview for the
same thing twice but the actual characterLists property only gets bigger by
one, so the tableview barfs.
I'm not registering for KVO twice, I checked that. There are no other KVO
messages removing or resetting the thing between the two inserts.
If I use the original parent MOC and original masterObject, not a problem, one
KVO call.
Is there anything obvious I could be doing wrong here or something else I could
look for, or am I returning to bugreporter again?
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