iOS 4.3 Simulator, Xcode 4.1, Lion 10.7.1
I'm having trouble generating a Core Data store and opening it in an iOS app
(in the Simulator so far).
My iOS app has to initialize a large, read-only dataset — a 12,000-word
vocabulary with definitions. In my early drafts, with 6000 words, I had it
parse a text file, but that took alarmingly long, and the watchdog timer would
probably kill it if I attempted the full dictionary.
So if I'm initializing an SQLite Core Data store anyway, why not do so at build
time, with a command-line tool on the Mac side?
So I have two targets. They share one managed-object class and a data model.
The builds for both compile the data model into a .momd. It's not the same
momd, but VersionInfo.plist in both is identical. The command-line tool takes
the .momd and the vocabulary text, and produces vocab.sqlite in SRCROOT. Using
Navicat for SQLite Lite, I verified that the contents of the file are (as far
as I can tell) what I expect.
The iOS target copies vocab.sqlite as a resource. I verified (by eye and by an
assertion in code) that it is in the .app bundle. I reviewed the build logs and
verified that the .sqlite file came from the place to which the command-line
tool wrote.
I get "The model used to open the store is incompatible with the one used to
create the store" when the iOS app tries to add vocab.sqlite to the persistent
store coordinator.
There is only one .momd in the .app bundle. The command-line tool takes a .momd
as an argument; I've tried pointing it at the .momd inside the bundle; still
"incompatible."
From everything I know to check, I'm doing this right. I've found nothing to
suggest you can't put a Mac-generated store into an iOS app, and much to
suggest that you should. I'm stymied. What should I try next?
— F
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