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Re: Inverse to-one relationships
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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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  • Follow-Ups:
    • Re: Inverse to-one relationships
      • From: Paul Hoadley <email@hidden>
    • Re: Inverse to-one relationships
      • From: Chuck Hill <email@hidden>
References: 
 >Inverse to-one relationships (From: Paul Hoadley <email@hidden>)
 >Re: Inverse to-one relationships (From: David Avendasora <email@hidden>)
 >Re: Inverse to-one relationships (From: Paul Hoadley <email@hidden>)
 >Re: Inverse to-one relationships (From: Chuck Hill <email@hidden>)
 >Re: Inverse to-one relationships (From: Paul Hoadley <email@hidden>)
 >Re: Inverse to-one relationships (From: Chuck Hill <email@hidden>)
 >Re: Inverse to-one relationships (From: Paul Hoadley <email@hidden>)
 >Re: Inverse to-one relationships (From: Chuck Hill <email@hidden>)
 >Re: Inverse to-one relationships (From: Paul Hoadley <email@hidden>)

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