Hi,
I'm a little confused about a setup involving core data, bindings,
NSArrayControllers and an NSCollectionView. Things were fine before I
used core data:
- I have an NSCollectionView, where each view item represents a KNBox,
which contains a list of KNDesktopThings, represented by a table
- I have subclassed NSCollectionView, so that each view item receives
its own NSArrayController, to which I bind the table
- I have also subclassed NSCollectionViewItem and made each item the
datasource of its table to implement drag and drop for the table
- before using core data, each view item would accept a drop, create a
new thing and add it to the array controller
- this worked perfectly
Now, with core data, things are a bit different:
- I have a data model with boxes and things. Things are related to
boxes via a "boxItems" relation
- here is how I set up the array controller (beware, this is CocoaRuby):
arrayController.setEntityName("KNDesktopThing")
arrayController.setContent(box.boxItems)
- here is what I do when I accept a drop and want to create a new thing:
managedObjectContext = NSApp.delegate.managedObjectContext
newThing =
NSEntityDescription
.insertNewObjectForEntityForName_inManagedObjectContext
("KNDesktopThing", managedObjectContext)
box.addBoxItemsObject(newThing)
arrayController.setContent(box.boxItems)
This works, but especially the last two lines make me wonder if I'm
not doing things the wrong way here. Is there a way I can set things
up so that I either:
- only add the new thing to the arrayController, which would hopefully
update the relation, or
- only add the new thing to the relation, which would hopefully update
the array controller.
Why do I want to use core data? Because I hope it will give me "free"
saving and undo.
Cheers,
Knud
-------------------------------------------------
Knud Möller, MA
+353 - 91 - 495086
Smile Group: http://smile.deri.ie
Digital Enterprise Research Institute
National University of Ireland, Galway
Institiúid Taighde na Fiontraíochta Digití
Ollscoil na hÉireann, Gaillimh
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