CODEWITHSUNDEEP
objective-cnstreecontroller
jeanlain
jeanlain

Reputation: 418

Issue with NSTreeController moveNode:toIndexPath:?

I'm using an NSTreeController set in entity mode, to manage a hierarchy of folders (a core data entity I call Folder). The "Children" key path is set to an NSArray readwrite property of Folder, which I call subfoldersArray. (I use NSArray because NSOrderedSet doesn't work with a tree controller).

When the user moves a folder to another folder (via an NSOutlineView) or at a different position of the same parent folder, the app calls moveNode:toIndexPath: on the tree controller. I use this method as it preserves the selection (while changing the underlying model tends to deselect the selected folder, even though the controller has preserveSelection set to YES.

Problem: every Folder instance that is moved by moveNode:toIndexPath: is placed at the end of the subfoldersArray, regardless of the index path specified. This happens only when the NSTreeController controls an NSManagedObject subclass (in either class or entity mode).

The exact same moveNode:toIndexPath: instruction on the same NSTreeController controlling an equivalent NSObject subclass (with an identical subfoldersArray property) works as expected.

I'd like a solution that doesn't involve setting the underlying model myself, as this tends to deselect the selected folder (which may not be the one that is moved).

Upvotes: 1

Views: 61

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