NSTreeController, NSOutlineView and Core Data (again)
NSTreeController, NSOutlineView and Core Data (again)
- Subject: NSTreeController, NSOutlineView and Core Data (again)
- From: Peter Ferrett <email@hidden>
- Date: Mon, 2 Mar 2009 19:41:48 +0000
I have Core Data objects bound to an NSOutlineView via a
NSTreeController. It is a schema that is common to other threads on
this group: one entity for the group, one entity for the leaf, and a
with the "children" relationship containing the groups/leafs of the
next level. The controller prepares the content. Everything works
fine, except that all objects appear at the root level. As observed
by others, I need to put a "parent == nil" fetch predicate to prevent
all objects appearing at the root level.
However ... with the fetch predicate is in place, the outline view
does not get updated until a new group/leaf with the "parent == nil"
predicate is inserted. When new leaf objects are inserted, they do
not appear in the outline view (until the next time that the an object
with the predicate is inserted).
I tried the following: observe
NSManagedObjectContextObjectsDidChangeNotification notifications, and
call [outlineView reloadItem: parent reloadChildren: YES] when the
notifications are received. The debugger indicates that the
notifications are being called and the reloadItem:reloadChildren:
method is called on the correct object (the parent of the new inserted
leaf). However, nothing happens.
Is this one of those methods that is no longer accessible when using
bindings? I am not sure what is happening and would welcome
suggestions on how to update the outline view to reflect the new
objects in the MOC.
thanks in advance
Peter F
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