Re: Core Data + NSOutlineView + Sorting without NSTreeController
Re: Core Data + NSOutlineView + Sorting without NSTreeController
- Subject: Re: Core Data + NSOutlineView + Sorting without NSTreeController
- From: Conor <email@hidden>
- Date: Sun, 08 Jul 2007 16:50:03 +0200
Hi Seth,
I would add a NSNumber position attribute to your objects and use that to
sort. You would have to change the numbers for all objects higher than where
you insert a new object, but it's no different than having to recreate your
array. I suggest this solution not because I know but because it's what I
would do rather keep a separate sorted array for each set of children.
Regards,
Conor
http://www.bruji.com/
> (I couldn't come up with a decent short-and-easy-to-understand
> subject for this email that was really accurate, but hopefully
> that'll do.)
>
>
> I've ditched using NSTreeController for a few reasons, so I'm back to
> using the data source methods to display my objects from Core Data.
> The question I have is about how best to keep an array of arranged
> objects (according to a sort descriptor). Before Core Data I had a
> mutable array for my children, so they were always implicitly
> ordered, and whenever the sort descriptor changed, I would just
> resort the array. (They only every showed up in one place, so there
> was never an instance of them needing to be simultaneously sorted in
> different ways.)
>
> But how should I do this with Core Data? Given that to-many
> relationships are sets, I'm wondering if I should do a similar thing
> and keep a sorted array as an instance variable in my NSManagedObject
> subclass and recreate and resort the array every time the objects on
> the many side of the relationship change. It would _work_ but it just
> seems so inefficient.
>
> Do any of you have a clever solution as to where should I store the
> sorted array and when I should sort it?
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