I'm facing a weird issue with SwiftData. I want to have one database that's local to the device and one that syncs to iCloud. In this example, LTRLink
should be synced via iCloud while LTRMetadata
should stay on-device only. I've it configured like the following:
let schema = Schema([LTRLink.self, LTRMetadata.self])
let cloudkitConfiguration = ModelConfiguration("Remote",
schema: schema,
url: FileManager.remoteDatabaseFolderURL.appending(path: "Remote.sqlite"),
cloudKitDatabase: .private("iCloud.com.xavimoll.abyss3"))
let localConfiguration = ModelConfiguration("Local",
schema: schema,
url: FileManager.localDatabaseFolderURL.appending(path: "Local.sqlite"),
cloudKitDatabase: .none)
return try ModelContainer(for: schema,
configurations: [cloudkitConfiguration, localConfiguration])
For some reason, when I create the iCloud schema, both models end up appearing as records on iCloud. I create the schema like this:
let schema = Schema([LTRLink.self, LTRMetadata.self])
let cloudkitConfiguration = ModelConfiguration("Remote",
schema: schema,
url: FileManager.remoteDatabaseFolderURL.appending(path: "Remote.sqlite"),
cloudKitDatabase: .private("iCloud.com.xavimoll.abyss3"))
#if DEBUG
// Needed to create the schema on iCloud
try autoreleasepool {
let desc = NSPersistentStoreDescription(url: cloudkitConfiguration.url)
let opts = NSPersistentCloudKitContainerOptions(containerIdentifier: cloudkitConfiguration.cloudKitContainerIdentifier!)
desc.cloudKitContainerOptions = opts
desc.shouldAddStoreAsynchronously = false
if let mom = NSManagedObjectModel.makeManagedObjectModel(for: [LTRLink.self]) {
let container = NSPersistentCloudKitContainer(name: "Remote", managedObjectModel: mom)
container.persistentStoreDescriptions = [desc]
container.loadPersistentStores {_, err in
if let err {
fatalError(err.localizedDescription)
}
}
try container.initializeCloudKitSchema()
if let store = container.persistentStoreCoordinator.persistentStores.first {
try container.persistentStoreCoordinator.remove(store)
}
}
}
#endif
let localConfiguration = ModelConfiguration("Local",
schema: schema,
url: FileManager.localDatabaseFolderURL.appending(path: "Local.sqlite"),
cloudKitDatabase: .none)
return try ModelContainer(for: schema,
configurations: [cloudkitConfiguration, localConfiguration])
The logic to initialize the CloudKit schema follows the documentation found here: https://developer.apple.com/documentation/swiftdata/syncing-model-data-across-a-persons-devices#Initialize-the-CloudKit-development-schema
It looks like setting cloudKitDatabase: .none
on the init
for the ModelConfiguration
doesn't do anything, and ends up being synced with iCloud either way. When I go to the iCloud console, I see the following:
Does anyone know if there's any workaround that would allow me to have two databases where only one of them syncs to iCloud when using SwiftData?
Turns out, this was my own issue! I was passing the schema
on both ModelConfiguration
s, when I should be passing a different Schema
for each configuration, and then a Schema
that contains everything to the ModelContainer
init
. I made such change, and now it works as expected, only the LTRLink
appear on iCloud's console!