Wonderful! Thanks very much. I will give this a try. Writing out the core data
store was the bit I was missing.
Martin
On Jun 29, 2011, at 9:54 AM, Quincey Morris wrote:
> On Jun 28, 2011, at 23:58, Martin Hewitson wrote:
>
>> In the past I achieved this in a somewhat unsatisfactory way by just calling
>> newDocument: then saveDocument: and getting the user to immediately save the
>> document before the app does the rest of the setup steps.
>
> Using the action methods (newDocument: and saveDocument:) is what makes your
> approach unappealing for the user. In Snow Leopard or earlier, for a regular
> document, the steps are something like this:
>
> 1. Get the project name and file system location. (You can use the Save panel
> for this, but you put it up yourself rather than having 'newDocument:' do it.
> Or, you can use some kind of custom dialog.)
>
> 2. Create a document file at that location. (Typically, you create a default
> data model or import some data, turn it into a keyed archive, write the
> archive data to a file.)
>
> 3. Use NSDocumentController's 'openDocumentWithContentsOfURL:display:error:'
> method to open the now-existing document normally.
>
> You can use much the same approach for NSPersistentDocument, but step 2 is a
> little different. Here's a method I wrote (based on some sample code
> somewhere in the Core Data documentation, but I don't remember where) that
> creates a new store. It returns a managed object context because you probably
> want to put something in the store (and 'save:' it) before re-opening it as a
> NSPersistentDocument in step 3.
>
>> + (NSManagedObjectContext*) managedObjectContextForStoreURL: (NSURL*)
>> storeURL
>> {
>> // Find the document's model
>>
>> NSManagedObjectModel* model = [NSManagedObjectModel
>> mergedModelFromBundles: nil];
>> if (!model)
>> return nil;
>>
>> // Create a persistent store
>>
>> NSPersistentStoreCoordinator* psc = [[NSPersistentStoreCoordinator
>> alloc] initWithManagedObjectModel: model];
>> if (!psc)
>> return nil;
>>
>> NSError* error;
>> NSPersistentStore* store = [psc addPersistentStoreWithType:
>> NSSQLiteStoreType
>>
>> configuration: nil
>>
>> URL: storeURL
>>
>> options: nil
>>
>> error: &error];
>> if (!store)
>> return nil;
>>
>> // Create a managed object context for the store
>>
>> NSManagedObjectContext* managedContext = [[NSManagedObjectContext
>> alloc] init];
>> if (!managedContext)
>> return nil;
>>
>> managedContext.persistentStoreCoordinator = psc;
>> managedContext.undoManager = nil;
>>
>> return managedContext;
>> }
>
> HTH
>
>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Martin Hewitson
Albert-Einstein-Institut
Max-Planck-Institut fuer
Gravitationsphysik und Universitaet Hannover
Callinstr. 38, 30167 Hannover, Germany
Tel: +49-511-762-17121, Fax: +49-511-762-5861
E-Mail: martin.hewit...@aei.mpg.de
WWW: http://www.aei.mpg.de/~hewitson
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
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:
http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
