CoreData detecting deleted entity after save

Question

if i delete an cd entity and than save the mod

[self.moc deleteObject:(NSManagedObject *)someCDEntity];

[self saveMoc];

the pointers to this cd entity will become faults

by trying accessing the fault or ask for isDeleted, i get a

'CoreData could not fulfill a fault for

the problem is, as soon as i save the mod, the isDeleted doesn't work any more

so how can i detect if an entity is removed? because just asking for isFault, doesn't indicate that it was deleted... and i cannot use isDeleted

What for do you need to know, if some particular object is deleted after MOC saving? — Dmitry Makarenko, Mar 09 '12 at 15:03

score 4 · Accepted Answer · edited May 23 '17 at 10:27

4

i found help in this OSX oriented thread

How can I tell whether an `NSManagedObject` has been deleted?

- (BOOL) entityWasDeleted:(SomeEntity *)someEntity {

    return ((someEntity == nil) || ([self.moc existingObjectWithID:someEntity.objectID error:NULL] == nil));
}

Beware : don't use the code bellow, as it might not always work

if (managedObject.managedObjectContext == nil) {
    // Assume that the managed object has been deleted = might not always work
}

edited May 23 '17 at 10:27

Community

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answered Mar 09 '12 at 13:03

Peter Lapisu

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Thanks for mentioning the beware, as I was just about to implement it that way. It makes sense that the first snippet is more reliable. – DonnaLea May 07 '14 at 00:57

score 1 · Answer 2 · answered Mar 09 '12 at 13:32

1

I use the prepareForDeletion method in NSManagedObject. It is called just before the deletion but while the object is still valid ( and not faulted ). Works like a charm!

answered Mar 09 '12 at 13:32

moritz

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yes, but i want to test after moc save – Peter Lapisu Mar 09 '12 at 13:38

CoreData detecting deleted entity after save

2 Answers2