Re: Merge changes between two Managed Object Contexts
Re: Merge changes between two Managed Object Contexts
- Subject: Re: Merge changes between two Managed Object Contexts
- From: Joanna Carter <email@hidden>
- Date: Sun, 21 Mar 2010 22:48:41 +0000
Hi Austin
> I've got a Core Data project and I have a window controlled by an NSWindowController that is used to add or edit an NSManagedObject. I wanted to create a separate Managed Object Context in the NSWindowController so that the changes made to the object aren't seen by the UI below and so I can just throw away the changes if the user clicks "Cancel". If the user clicks "Save' I wanted to merge the changes from the temporary MOC to the main MOC being used by the rest of the application.
>
> What is the best way to merge those changes back to the main MOC? Do I have to recreate the object in the main MOC as is done in this example: http://www.timisted.net/blog/archive/multiple-managed-object-contexts-with-core-data? Or, can I use - (void)refreshObject:(NSManagedObject *)object mergeChanges:(BOOL)flag to merge the changes? If i use refreshObject:mergeChanges, can I pass it my NSManagedObject from the temporary MOC and do I need to call save: on the temporary MOC before doing that?
I have created a basic tutorial that demonstrates both adding and editing and object. AFAICT, you need to take two different approaches. The tutorial is available at http://www.richplum.co.uk/magazine/dg201001.pdf
Joanna
--
Joanna Carter
Carter Consulting
_______________________________________________
Cocoa-dev mailing list (email@hidden)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden