I have a table of Core Data objects and a set of inspector views. Depending on the Class(es) of the selection in the table view, the set of inspector views changes.

I managed the inspector views with NSViewControllers. The fields in the inspector view are bound to the view controller's representedObject -- ex. representedObject.radius. This works, but when I add a deeper path to the mix (ex. representedObject.material.refractionIndex), I get the following message in the console when the selection changes:

2008-04-06 22:35:40.095 RayT[14429:10b] Cannot remove an observer <NSKeyValueObservance 0x11434b1c0> for the key path "material.refractionIndex" from <_NSControllerObjectProxy 0x114329b30>, most likely because the value for the key "material" has changed without an appropriate KVO notification being sent. Check the KVO-compliance of the _NSControllerObjectProxy class.

The first selection works, but each selection change after that trigger this message.

Since the applicable inspector views change, I set their representedObject just before adding them to the screen:

[controllers makeObjectsPerformSelector:@selector(setRepresentedObject:) withObject: [configController selection]];

Where controllers is the list of inspector views and configController is the array controller. If I precede this by first setting the representedObject to nil, I get the message every other selection event, rather than every event.

Can anyone help shed some light on this situation?

Thank you,
Jacob Lukas
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