Re: Core Data: Determine if managed object is deleted
Re: Core Data: Determine if managed object is deleted
- Subject: Re: Core Data: Determine if managed object is deleted
- From: Quincey Morris <email@hidden>
- Date: Thu, 20 Oct 2011 17:27:57 -0700
On Oct 20, 2011, at 15:37 , Jerry Krinock wrote:
> When I need to know whether or not a managed object is deleted, often I fall into the trap of trying -[NSManagedObject isDeleted], forgetting that its documentation states …
>
> "… It may return NO at other times, particularly after the object has been deleted. …"
>
> In other words, they should have named that method -isDeletedForSure, to indicate that the NO result is not reliable.
>
> Anyhow, today I fixed a problem by using this instead …
>
> BOOL isDeleted ;
> isDeleted = [object isDeleted] || ([object managedObjectContext] == nil) ;
>
> I'm not sure if it will work in all situations. I suppose that sending the magical -processPendingChanges would be another workaround.
FWIW, I also wonder if this ("Is it deleted?") is the right question to ask. As you've documented here, the technical question is largely a housekeeping one -- about how the object is represented in terms of the in-memory object graph vs the persistent store, faulting, etc.
Functionally, isn't the question likely to be whether the object is … I dunno … *reachable* any more? From that point of view, the criterion may well be whether a key relationship of the object is null or not.
IOW, it's a question of the object's role, not its representation, and the Core Data representation isn't conclusive as to the role.
It's just a thought. You seem to have been chasing these representation-related deletion issues for months now, or longer.
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