How should I store a Core Data 'selected' item?

Question

My application needs to keep track of which managed object is currently selected. In memory this is easy, but the question is how do I do this when my application exits and restarts.

Can I write the object itself to NSUserDefaults and then retrieve it later (I think this wouldn't be the same object thou, just a copy) Or can I store the entity id somehow? Or is there another way I'm overlooking?

Here is a detailed answer: http://stackoverflow.com/a/516735/1090886 — Rob Reuss, Dec 12 '11 at 19:27

score 3 · Accepted Answer · answered Dec 12 '11 at 19:21

Just store the NSManagedObjectID. You will likely have to store it as an NSString from the NSURL (URIRepresentation).

Also make sure it is NOT a temporary ID. When the app starts again, load the NSManagedObject from the NSURL from the string you saved.

How should I store a Core Data 'selected' item?

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