Re: Problems extending NSPersistentDocument Core Data Tutorial
Re: Problems extending NSPersistentDocument Core Data Tutorial
- Subject: Re: Problems extending NSPersistentDocument Core Data Tutorial
- From: Simon <email@hidden>
- Date: Mon, 19 Nov 2007 17:29:08 +0100
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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