ios - Core Data Store included in App Bundle

Question

I can't find a clear description of these steps in Apple docs...

1. I have a xcdatamodeld in my xcode project
2. At launch time, my app parses a XML (project resource) to fill the Core Data Store (SQLLite)
3. During lifetime of my app, I add, remove, update data of that Store

Now, I want to stop doing that heavy XML parsing process on device and directly include a Store containing the required data.

I have some questions regarding this :

• Can I fill a store with a OS X app and then include this store in my XCode-iOs project ?
• My store does not appear in Xcode. In fact it is created at run time. How can I add a store in the project and link it to my xcdatamodeld ?
• I have read that doing so will prevent my store from being writable... I guess I have to copy it in the right place at launch time (the Core Data utility Tutorial is a great help for that). Am I right ?

Thanks for your hints. URL or other SO questions would be really appreciate !

Kheraud

Answer 1

You can include the store file (sqlite db most of the time) in your app. Then in your app delegate edit the persistentStoreCoordinator getter merhod :

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {

    if (persistentStoreCoordinator_ != nil) {
        return persistentStoreCoordinator_;
    }

    NSString *storePath = [[self applicationDocumentsDirectory] stringByAppendingPathComponent: @"CoreDataStore.sqlite"];

    // Check if the store exists in. 
    if (![[NSFileManager defaultManager] fileExistsAtPath:storePath]) {
        // copy the payload to the store location.
        NSString *bundleStore = [[NSBundle mainBundle] pathForResource:@"YourPayload" ofType:@"sqlite"];

        NSError *error = nil;
        [[NSFileManager defaultManager] copyItemAtPath:bundleStore toPath:storePath error:&error];

        if (error){
            NSLog(@"Error copying payload: %@", error);
        }
    }

    NSError *error = nil;
    NSURL *storeURL = [NSURL fileURLWithPath:storePath];
    persistentStoreCoordinator_ = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
    if (![persistentStoreCoordinator_ addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) {
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }    

    return persistentStoreCoordinator_;
}