On Jul 31, 2008, at 14:04, Pete Callaway wrote:
I don't think I'm doing anything behind Core Data's back particularly. "selectedPage" is a property of the NSPersistentDocument, not of an NSManagedObject. I have several view controllers and they each need to know which entity to show the detail of. It seemed to me that the obvious way to do this was to maintain a pointer to the selected page in a central location and the document seemed to be the ideal spot.
Er, sorry, I was mesmerized by those ...AccessValueForKey calls. They're methods of NSManagedObject, so I just assumed that 'self' was some kind of NSManagedObject. In fact, your posted implementation of selectedPage ought to get compilation errors (including one for the missing semi-colon at the end).
My guess (and, sorry, I'm just guessing) is that the text view is getting bound to the string object fetched by document.selectedPage.textContent at the time the binding is set up (i.e. bound to key "self" of some string) instead of getting bound to key "selectedPage.textContent" of the document. You could find out by selecting a different page (so that the wrong text is displayed) and then change the text and press Return. Then save and reopen the document to find out which page (if any) actually got changed.
Plan B might be to add a NSObjectController. Bind the object controller to the document, and bind the text view to the object controller, controller key "selection", data model key "selectedPage.textContent". (You kind of want to do that anyway, because the object controller has the logic to commit the text field if you try to close the document window while the text field is being edited.)
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