Re: Core Data: Need help with fetch request
Re: Core Data: Need help with fetch request
- Subject: Re: Core Data: Need help with fetch request
- From: Jakob Olesen <email@hidden>
- Date: Sun, 15 Oct 2006 14:06:38 +0200
On 15/10/2006, at 14.02, Diederik Hoogenboom wrote:
When I designed the model I though I would never have to go the
other way (in the example from Wheels to Cars). I can add the
relationship and then it would probably work.
You should test this first, your fetching problem may be unrelated to
the missing inverse relationship.
Unfortunately, I now have to convert the whole persistent store
from the old model to the new model just for one relationship! If
I add the relationship the old store will complain that the field
is unkown (eventough it's set to 'optional'. Oh well, that's what
you get from not following the rules ;-).
The rule is: You should have a really, really good reason for
creating a unidirectional relationship, and you need to know what you
are doing.
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