Re: Inverse to-one relationships
Re: Inverse to-one relationships
- Subject: Re: Inverse to-one relationships
- From: Paul Hoadley <email@hidden>
- Date: Fri, 23 Jul 2010 10:47:49 +0930
On 23/07/2010, at 10:20 AM, Chuck Hill wrote:
>> 1. It only works when I call a.addObjectToBothSidesOfRelationshipWithKey(b, "b"). (Don't get me wrong—that's great, an enormous improvement on what I was doing 5 minutes ago.)
>
> Did you add versions of this method to both entities?
Yes.
>> I've got Wonder's updateInverseRelationships property set true, but it doesn't seem to be automatically updating this relationship. (It is working as designed on others.) In fact, inverseForRelationshipKey() isn't even being called, unless I manually call addObjectToBothSidesOfRelationshipWithKey(). Is this expected?
>
> I don't know.
OK. I'll work around it.
>> 2. Slightly more academic: why did everything I had read previously make me think this wouldn't work? I had also read that post from Chuck quoted in this thread by Ramsey:
>>
>>> You could model it as a right-outer join and optional, but I think that EOF is still going to have a hissy fit when it does not find the row. Worth a try and a good bug to log with Apple if it does not work.
>>
>> Chuck, were you talking about something else there? (Presumably the answer is: I was mis-reading everything, and I didn't describe the problem clearly enough for Ramsey!)
>
> I am pretty sure that was referring to a PK - PK relationship when the PK is propagated from the parent to the child.
Ah, OK. Well, this has all ended quite nicely. Thanks all.
--
Paul.
http://logicsquad.net/
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