Thanks, Rob. I do have this book, but I sort of skipped the section
about multithreading (where the export example is buried), but I've
found it now.
Thanks to the others who replied as well. I think this has set me on
the right track.
@Jerry: I chose not to use a document-based design because I want all
the meetings and categories to be available as a list in the app,
rather like Mail.app with mailboxes and messages. Then a 'normal' core-
data app seemed more appropriate to me.
Martin
On Nov 9, 2009, at 3:23 AM, Rob Keniger wrote:
On 09/11/2009, at 5:18 AM, Martin Hewitson wrote:
I've been digging around for export and import strategies to allow
me to export parts of a core data model. In more detail, I have a
set of categories, each of which contains a set of meetings. Each
meeting has a fairly complex object graph below it (agenda, agenda
items, location, title, etc). I want to allow the user to export a
meeting which can then be imported by someone else using the same
application.
Does anyone have any good advice how best to approach this? I was
considering making the NSManagedObject subclasses conform to
NSCoding, but I read in a couple of places that this was difficult
to do, particularly the initWithCoder: part. Anyone tried this
already?
Yes, I've done this. What I did is create a second NSManagedContext
with a separate NSPersistentStore and copy the relevant objects out
of the main NSManagedContext into the new one. You basically do the
reverse on import.
There is an excellent example of how to handle import and export in
Marcus Zarra's Core Data book:
http://pragprog.com/titles/mzcd/core-data
I highly recommend getting a copy if you're working with Core Data.
--
Rob Keniger
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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 protected]
WWW: http://www.aei.mpg.de/~hewitson
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