On Aug 29, 2009, at 15:59, Clayton Leitch wrote:
I have spent the last month try to solve a simple problem. I need
to get the managedObjectContext in a NSDocument based application.
I know how to get this in a non-document based application
-(NSManagedObjectContect *)managedObjectContext {
if (!managedObjectContext) {
managedObjectContext = [[NSApp delegate] managedObjectContext];
}
return managedObjectContext;
}
From the documentation it appears that I get the managedObject
Context from the MyDocument instead of the application delegate. I
tried a similar structure to the above replacing NSApp delegate with
MyDocument. Does anyone have an example of getting the
manageObjectContext from the MyDocument class?
You haven't given quite enough information here.
If you mean that your documents are themselves Core Data stores, then
you need your document subclass (MyDocument) to be a subclass of
NSPersistentDocument instead of NSDocument. If you started from the
Core Data document-based application template in Xcode, that's what
you were given to start with. Then getting the MOC is easy --
NSPersistentDocument has a 'managedObjectContext' property which you
simply access.
Since you mention "replacing NSApp delegate with MyDocument", it's
possible you're trying to get the MOC from your MyDocument *class*
object ("[MyDocument managedObjectContext]"). If so, that of course
doesn't work. It's an instance property ("[myDocument
managedObjectContext]").
If you mean that your documents are not Core Data stores, but refer to
a shared Core Data store, then of course you continue to ask the
application delegate for the MOC.
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