Re: Core Data validateForUpdate
Re: Core Data validateForUpdate
- Subject: Re: Core Data validateForUpdate
- From: Mike Abdullah <email@hidden>
- Date: Sun, 20 Dec 2009 12:00:44 +0000
I think you misunderstand what -validateForInsert: and friends are for. They use "insert" here in the sense of inserting into the persistent store.
So -validateForInsert: is called the first time the object is added to the store (calling -[NSManagedObjectContext save:] ). From then on, -validateForUpdate: will be called at each save that will modify the object. And finally, -validateForDelete: if removing from the store.
On 20 Dec 2009, at 08:19, Gerriet M. Denkmann wrote:
> I have a document based Core Data app.
>
> MyDocument.nib contains an NSTableView bound to an NSArrayController.
> There also are "+" and "-" buttons, which send "add:" resp. "remove:" to the array controller.
>
> SomeEntity.m (subclass of NSManagedObject) implements validateForInsert:, validateForUpdate: and validateForDelete: - none of which are ever called. Why?
>
> What I try to accomplish:
> SomeEntity has a property called "uniqueKey" and this is (no big surprise) meant to be unique.
>
> When the "UniqueKey" column in my table view gets edited, validateUniqueKey:error: gets called, I check the new value for uniqueness and all is fine.
>
> But hitting the "+" button several times inserts several objects with the same key (Default Value).
>
> What should I do? How to make validateForInsert: get called? 10.6.2.
>
>
> Kind regards,
>
> Gerriet.
>
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