Re: CoreData retain/release/delete

FROM : Scott Stevenson
DATE : Fri Apr 29 21:07:32 2005

On Apr 29, 2005, at 11:53 AM, John Brownlow wrote:

> You edit your document, and delete whatever it is that requires the
> managedObject. The managed object is released and its retain count
> falls to 0.
>
> What happens now? I know that the managedObjectContext will retain
> certain objects with pending changes, so is that what happens here? Is
> it actually only de-allocated when the MOC saves the next time?


I believe the object hangs around until you save, but it should return
YES to -isDeleted in the meantime.


> More importantly, what happens to the copy in the persistent store?


Unchanged until you save.


> When the MOC saves, is the persistent store overwritten, and the
> object effectively deleted from the saved file, or does it hang around
> and have to be deleted manually using the -deleteObject method?


You only have to delete it once, then save. Does that answer the
question?

A Managed Object could also be deleted indirectly if it's at the
destination end of a relationship which is set to "cascade", and the
owner of the relationship is deleted.


    - Scott

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