Core Data and Multiple Persistant Stores

Question

I am using Core Data to save a bunch of information.

Lets say I have option for 3 different saves in a game. If the user selects SaveGame1, it loads SavedGameStore1. If the user selects SaveGame2, it loads SavedGamedStore2.

They all contain the same Entities.

I don't need to transfer information from one Store to another Store.

My understanding of the Persistent Stores and Persistent Store Coordinator is a bit shaky.

I am using Magical Record.

In the appDelegate:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.

    [MagicalRecord setupAutoMigratingCoreDataStack];
}

Magical Record has a method setupCoreDataStackWithSotreNamed:.

Is it as simple as after the user makes his selection, just call that method? That would switch it from the default store to my SavedGameStore1?

Answer 1

That should be correct. You'll want to (carefully) call [MagicalRecord cleanUp] to tear down the existing core data stack before loading in a new one with [MagicalRecord setupCoreDataStackWithStoreNamed:].

I wonder if you can't put all the save game data into a single store? Could you add an additional entity with relationships to the save game data? This will likely simplify things...