Re: Core data: Inverse relationships with subclasses
Re: Core data: Inverse relationships with subclasses
- Subject: Re: Core data: Inverse relationships with subclasses
- From: Gideon King <email@hidden>
- Date: Thu, 30 Sep 2010 08:57:40 +1000
Hi Jerry,
Can I just clarify what you mean about working around a bug on 10.5? I do need this to work on 10.5.
FooSub is a subentity of Foo, and both have their classes defined, with FooSub's class being a subclass of Foo's class.
Thanks
Gideon
On 30/09/2010, at 3:49 AM, Jerry Krinock wrote:
>
> On 2010 Sep 29, at 09:19, jeremy wrote:
>
>> For a solution, rework your schema to subclass FooSub directly from NSManagedObject.
>
> That might work. If it doesn't,
>
> On Sep 29, 2010, at 9:28 AM, Gideon King wrote:
>
>> All entities are concrete … I would have thought it would be OK for the relationship to point to an instance of FooSub shouldn't it? After all, it is a subclass of Foo.
>
> Not sure about that. I'd have made it be a subentity. Core Data knows more about entities than classes.
>
> (But if you do make a subentity, and do a migration someday, remember that you need to work around a bug if you allow operation in Mac OS 10.5.)
>
>
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