Hi Paul,
I recommend not use the add: / addChild: methods of the
TreeController, but create yur own methods for that. In each
instantiate an object of the entitytype you want as parent/child. See http://developer.apple.com/DOCUMENTATION/Cocoa/Conceptual/CoreData/Articles/cdCreateMOs.html#/
/apple_ref/doc/uid/TP40001654 for how to create objects in code. Set
the proper parent objects , that is nil for parents and the parent
entity for the children.
I have the same solution in a couple of apps with exactly the same
structure and needs as I gather you have.
Cheers,
Volker
Am 22.02.2009 um 20:19 schrieb Paul Franz:
I have a simple class hierarchy defined in Model for the Core Data
Entity:
Class: AbstractClass (Abstract Class is checked as abstract
Parent Class: None
Attributes:
Name
Children
Class: Class1
Parent Class: AbstractClass
Attributes: None
Class: Class2
Parent Class: AbstractClass
Attributes:
Description
Cost
How do I create a subclass of Class1 or Class2 instead of the
abstract class AbstractClass?
I have created a NSTreeController in IB. The Attributes tab for the
NSTreeController, the Key Paths (Children) is set to Children and
Object Controller (Mode) is set to Entity with the Entity Name is
set to AbtractClass. I have a NSOutlineView which is bound to this
NSTreeController. And a New button to create a new entity is bound
to the add method of the NSTreeController and a New Child button
to create a new child is bound to the addChild method of the
NSTreeController. It seems to work. But I have no idea what types of
entities are being created. My assumption is that they are of type
AbstractClass.
Paul Franz
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