Setting Core Data Object to nil

Question

I am not sure about this, but does setting a core data object to nil, deletes it from Core Data. For Example:

MyObject *obj = [MyObject fetchFromCoreDataWithID:objectID];
obj = nil;

Does this deletes that object from Core Data ?

score 2 · Accepted Answer · answered Jun 08 '12 at 10:30

2

No. The object is only a representation of what is in your CoreData store. If you want to delete the object you must do this:

NSError *saveError = nil;
[_managedObjectContext deleteObject:obj];
[_managedObjectContext save:&saveError];

answered Jun 08 '12 at 10:30

Eimantas

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score 1 · Answer 2 · answered Jun 08 '12 at 10:30

1

No.

You need to do the following to delete it:

[managedObjectContext deleteObject:obj]

See the documentation for more detail.

answered Jun 08 '12 at 10:30

Stephen Darlington

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This only marks object for deletion. The data is still present until the context is saved. – Eimantas Jun 08 '12 at 10:31
True. I was trying to provide a literal version of `obj = nil` that would work; as you say this does not affect the disk representation. – Stephen Darlington Jun 08 '12 at 10:35
1

P.S. You can check if object is mark for deletion with `isDeleted` method call .) – Eimantas Jun 08 '12 at 10:41

score 1 · Answer 3 · answered Jun 08 '12 at 10:31

1

No. To delete check out deleteObject.

answered Jun 08 '12 at 10:31

unexpectedvalue

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score 0 · Answer 4 · edited May 23 '17 at 12:03

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You can also create your NSManagedObject without adding it to NSManagedObjectContext. Then you don't need to delete it at all. See this for more details: Inserting a new managed object in Core Data.

edited May 23 '17 at 12:03

Community

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answered Jun 08 '12 at 13:22

Adam

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Setting Core Data Object to nil

4 Answers4