Re: Problems extending NSPersistentDocument Core Data Tutorial

FROM : Simon
DATE : Mon Nov 19 17:29:08 2007

Ok, I've got part of my question answered (RTFM http://developer.apple.com/documentation/Cocoa/Conceptual/CoreData/Articles/cdChangeManagement.html#/
/apple_ref/doc/uid/TP30001201, section Communicating Changes Between 
Contexts). Managed object contexts are not synchronized and that is 
the way how it should be according to the documentation. However, I've 
tried to implement solution 2 from that document (reset second managed 
object context) to no avail. I've reset the second moc but the 
departments still do not show up. Do I have to save the first moc? It 
seems that way (it works when I save before opening the new object 
sheet). That's definitely not what I want. I don't want to force the 
user to save the document just that the departments show up in the new 
object sheet. How can I make the added departments visible in the new 
object sheet?

Simon

On Nov 18, 2007, at 9:42 PM, Simon wrote:

> Hi
>
> I want to extend the core-data application from the 
> NSPersistentDocument core data tutorial with some additional 
> functionality. I've added a sheet to manage a tree of departements. 
> The Department entity has two additional relationships, a parent and 
> an inverse children relationship. I've successfully managed to bind 
> an NSTreeController and an NSOutlineView. Now, I want to add an 
> NSPopupButton to the new object sheet which allows to choose the 
> department for a new employee.
>
> However, if I launch the application and add some departments and 
> then try to add a new employee, the NSPopupButton is not updated 
> (that is, it stays empty). If I save the document, reopen it and add 
> a new employee, the popup button is properly populated. Below the 
> changes I've made in the new Employee Sheet NIB.
>
> * NSArrayController for the departements
> ** managedObjectContext bound to managedObjectContext of File's Owner
> * NSPopupButton for the departements
> ** Content bound to array controller arrangedObjects
> ** Content Values bound to array controller arrangedObjects key path 
> name
> ** Selected Object bound to Object Controller arrangedObjects key 
> path department
>
> If I bind the array controller's managedObjectContext to the 
> documentManagedObjectContext of File's Owner, the popup menu is 
> populated (I can't complete the sheet because the department is from 
> a different managed object context and that is obviously not 
> allowed). How can I make sure that the changes from the departments 
> sheet are visible in the new object sheet's popup button?
>
> Thanks
> Simon
>
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