On Feb 28, 2006, at 5:55 AM, Aurélien Hugelé wrote:
Some answers from myself
But i have some problem to understand if I have to synchronize
both MOC manually or not and how? i mean, should i insert in the
main thread moc (using [moc1 insertObject:[moc1
objectWithID:objectId]]) the objects i inserted in the threaded
moc (ie moc2, using
insertNewObjectForEntityForName:inManagedObjectContext:) ? from
what i have read on this list, i have to synchronize mocs,
nothing is done for me.
From my test, to make the main thread array controller aware of
the new objects, i have to use insertObject: on the moc1.
reinserting an object in another context is an error, at the next
save: of the context, you'll get an error, the object is already
inserted blah blah blah.
So how can i make my array controllers aware of the newly inserted
objects ?
NSManagedObject implements:
- (NSManagedObjectID *)objectID;
NSManagedObjectContext implements:
- (NSManagedObject *)objectWithID:(NSManagedObjectID *)
objectID; // returns the object for the specified ID (the object
does not already need to be registered in the context, it might be
fetched or returned as a fault) - the object is assumed to exist as
described by the ID
Use the first to grab the object ID from your thread, use the
second to make the main event loop's MOC aware of the object.
Oh, and be very careful when working with threads. They can
easily be woven into a nice hangman's rope....
b.bum
Thanks for the answer, i have already use [moc1 objectWithID:], in my
code above. I already succeeded to get the background-thread-inserted-
object "realized" in the main thread, but what is *not* working, is
the update of the array controllers:
Since the object has not been inserted in the main thread (but only
"realized" via objectWithID:), the array controllers are not informed
of the insertion, and thus the tableview is not displaying the new
object.
i've reverse engineered what happen when an object inserted into a
context, and how array controllers (_NSManagedProxy) are informed via
@"_NSObjectsChangedInManagingContextPrivateNotification"
notification... but this of course occurs when an object is inserted
in the context *observed by the arraycontroller*.
My object is inserted in the *subthread context* (and saved in this
thread), not the one observed by the array controller and thus the
array controllers in the main thread are not informed of the
insertion...
any idea ?
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