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I'm working on an OSX (Mac OS) document based app with Core Data.
I'm having problems importing in a PrivateContext. Importing in the MainContext works fine, but of course freezes the UI.
May 15, 2008 Buy it at Amazon. Hillegass, Aaron. May 15, 2008. Many folks refer to this as the 'bible' for learning Cocoa. As Coach Corso would say, 'Not so fast, my friend!' When it comes to Core Data, there are two application models that differ drastically in their handling of the Core Data Stack: the document model and the non-document model. Document Model. In a document model, each document has its own Core Data stack that is constructed when the NSPersistentDocument.
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The app has a NSPersistentDocument (Document.h and .m).
In this document I have autosavesInPlace enabled (YES).
The Window belonging to the Document is added in makeWindowControllers
- (void)makeWindowControllers {
familyWindowController *myWindow = [[NSStoryboard storyboardWithName:@'Main' bundle:nil] instantiateControllerWithIdentifier:@'Document Window Controller'];
[self addWindowController: myWindow];
myWindow.managedObjectContext = self.managedObjectContext;
}
The WindowController gets his NSManagedObjectContext (MOC) from self.managedObjectContext.
This Window and MOC are given to childViewControllers, like the sheet I use for the import progress from a file.
The import sheet (ViewController) has a NSWindow property and a MOC property which is set by the prepareForSegue.
Next to the MOC from the Main window I have a PrivateContext (MOC).
It turn out that the originally created MOC is NOT of the NSMainQueueConcurrencyType. This is required is you want to use it with a parentContext.
With this code I change it (maybe this is wrong?).
NSManagedObjectContext *context = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];
context.persistentStoreCoordinator = self.managedObjectContext.persistentStoreCoordinator;
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[context setMergePolicy: NSMergeByPropertyStoreTrumpMergePolicy];
_managedObjectContext = context; // _managedObjectContext is the local MOC from the WindowController
The privateContext is created with this code.
_privateContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
_privateContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
![Nspersistentdocument Nspersistentdocument](/uploads/1/1/0/4/110432269/878998078.png)
_privateContext.parentContext = _managedObjectContext;
_privateContext.undoManager = nil;
![Nspersistentdocument core data tutorial for mac os Nspersistentdocument core data tutorial for mac os](/uploads/1/1/0/4/110432269/959469557.png)
I parse an XML with Google’s GDataXMLNode.
Core data objects are created with
Nspersistentdocument Core Data Tutorial For Mac Free
Person *currentPersonObject = [NSEntityDescription insertNewObjectForEntityForName:@'Person' inManagedObjectContext:_managedObjectContext];
What works:
If I don’t change the MOC to a NSMainQueueConcurrencyType, everything works fine, but I have a frozen UI.
What don’t work:
- When I make the MOC into a NSMainQueueConcurrencyType, I can import the data, but it doesn’t save to the file. I suspect something is wrong with the persistentStore, but I don’t see what.
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- When I use the PrivateContext (thru the Parent) I can get progress in the UI en UI updates, as long *** I don’t move the Window or trigger a Window refresh. I think this is because of the NSTableViews in the Window, which all use Core Data and binding. So when they refresh the view you get Core Data errors (out of bound…). No Idea how to fix this.
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Any ideas are welcome.
An example with OSX NSDocument and Core Data would be even better