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Re: Persistent Stores and Packages ...


On May 23, 2005, at 10:41 AM, mmalcolm crawford wrote:
On May 23, 2005, at 9:42 AM, SA Dev wrote:

- The first is how to get my XML store (which is saving and opening just fine right out of the box) to be saved to and read from a package. What do I fudge with? Subclass a context, a persistent store, or will NSPersistentDocument do everything I need it to if I only override the correct methods? I'm aware I have to check the "Package" checkbox in my document types (I have a document with my chosen extension and a unique UTI, XML store type). What reference material can help me with this? Has anyone tried this yet?
From <http://developer.apple.com/documentation/Cocoa/Reference/ ApplicationKit/ObjC_classic/Classes/NSPersistentDocument.html#// apple_ref/occ/cl/NSPersistentDocument>

"You can customize the architecture of the persistence stack by overriding the methods managedObjectModel and configurePersistentStoreCoordinator:forURL:ofType:error:. You might wish to do this, for example, to specify a particular managed object model, or to distribute storage of different entities among different file stores within a file wrapper."

- The second problem may be answered by the first problem's solution. I need to know how my NSManagedObject subclasses can ask their document for the package path (so, say, a "StoredImage" object can write itself to the package's Stored Images subfolder on -willSave and load/cache it again when its imageData is asked for. Or is this not the best way to do it? Let me elaborate ...
Again start with configurePersistentStoreCoordinator:forURL:ofType:error: -- see also <http://developer.apple.com/documentation/Cocoa/Conceptual/ NSPersistentDocumentTutorial/index.html>

Bah, my apologies.  :-((

No, this won't work. There's an "issue" with the interaction between NSDocument and NSPersistentDocument such that file packages/wrappers don't play well together. This is a "known issue". There isn't a workaround short of creating your own document architecture...

mmalc

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 >Persistent Stores and Packages ... (From: SA Dev <email@hidden>)
 >Re: Persistent Stores and Packages ... (From: mmalcolm crawford <email@hidden>)



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