Core Data versioning woes
Core Data versioning woes
- Subject: Core Data versioning woes
- From: Graham Perks <email@hidden>
- Date: Sun, 10 Aug 2008 00:36:34 -0500
Wow, versioning looks SO much better in 10.5. I had my own code for
10.4, I am glad to delete it.
I got a quick demo versioning app going, thanks to some excellent
advice at http://www.timisted.net/blog/archive/core-data-migration/.
The docs should really include that NSDocument override for
configurePersistentStoreCoordinatorForURL:.
Anyway, in my real application I am having trouble. I created a new
model version with an extra dummy field. Created the mapping file. And
now I get an empty document shown with the following error in the
console:
*** -[NSConcreteValue count]: unrecognized selector sent to instance
0x16577ca0
I get that line twice. Any ideas? I don't know where to even start
with that one.
My 10.4-style versioning code I optimistically removed from the
project. Please don't make me bring that mess back :-)
Thanks,
Graham Perks.
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