Re: Implementing NSOutlineView autosaveExpandedItems with CoreData
Re: Implementing NSOutlineView autosaveExpandedItems with CoreData
- Subject: Re: Implementing NSOutlineView autosaveExpandedItems with CoreData
- From: Ron Lue-Sang <email@hidden>
- Date: Tue, 1 Jul 2008 09:19:51 -0700
On Jul 1, 2008, at 12:05 AM, Andy Kim wrote:
Thanks - I've seen solutions like this before, I just wanted to get
it working the regular way!
I totally understand the sentiment.
Is itemForPersistentObject expecting an NSTreeNode? You say you
have it working in a similar way - what does your
itemForPersistentObject method return?
Many thanks
Ian
Here's what I do:
- (id)outlineView:(NSOutlineView *)ov itemForPersistentObject:
(id)object
{
return [[gAppDelegate library] groupWithUID:object]; // This
fetches the group from the managed object context
}
- (id)outlineView:(NSOutlineView *)ov persistentObjectForItem:(id)item
{
return [item uid];
}
According to the docs I'm supposed to archive the persistent object
before returning it, but in my case, it doesn't matter because it's
just a string and it all goes into a plist anyway. I have tried it
both ways after seeing your implementation though, and there are
indeed no differences.
I see why you're thinking that you need to return a NSTreeNode
though. I don't need to do that because I don't use a
NSTreeController and instead implement the data source protocol in
my custom controller. So for me the item is the model object itself.
In your case, I'm fairly positive that you do need to return the
NSTreeNode object. Instead of fetching the model object, walk the
controller's content tree looking for the right representedObject
with the UID.
- Andy Kim
Andy, you're right.
Ian's code needs to return an NSTreeNode. Please file a bug that this
is too hard.
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