Re: Inverse to-one relationships
Re: Inverse to-one relationships
- Subject: Re: Inverse to-one relationships
- From: Ramsey Gurley <email@hidden>
- Date: Fri, 23 Jul 2010 10:14:15 -0400
On Jul 22, 2010, at 9:17 PM, Paul Hoadley wrote:
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/
Nice trick Chuck (^_^) You are awesome! And it seems so simple now, I
wonder why I didn't try it sooner. This appears to work in both
directions for me. I must have looked through 10 years of archived
list messages and never found an answer to this one.
Anyway, thank you again Chuck and thank you too Paul for asking the
question one more time.
Ramsey
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