Re: NSDocument new file logic
Re: NSDocument new file logic
- Subject: Re: NSDocument new file logic
- From: Martin Hewitson <email@hidden>
- Date: Wed, 29 Jun 2011 10:14:16 +0200
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: email@hidden
WWW: http://www.aei.mpg.de/~hewitson
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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