Re: Core Data migration and non-optional transient relationships
Re: Core Data migration and non-optional transient relationships
- Subject: Re: Core Data migration and non-optional transient relationships
- From: Mike Abdullah <email@hidden>
- Date: Tue, 20 May 2014 17:07:19 +0100
On 20 May 2014, at 15:21, Sean McBride <email@hidden> wrote:
> Hi all,
>
> Doing a Core Data migration (not the lightweight kind) I hit an error at the end:
>
> "foo is a required value."
>
> the 'foo' relationship it complains about is transient and so not present in the store. Normally, I recreate the relationship in awakeFromFetch, but it doesn't seem to call that during migration. As a test I made the relationship optional, then it no longer complains.
>
> This seems to mean that transient relationships must always be optional?! At least if you ever want to migrate. That seems odd. Am I missing something here?
How about -awakeFromInsert? During a migration, new objects are being created, based on the existing ones. Thus -awakeFromInsert gets called on them rather than -awakeFromFetch.
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