Migrate persistentStoreCoordinator sqlite file to new name - ios

Question

When I was attempting to troubleshoot an issue with me sqlite file I realized that in my AppDelegate had an error.
let url = self.applicationDocumentsDirectory.appendingPathComponent("SingleViewCoreData.sqlite")
I want change the file name to match the app name but I don't want to lose the current data in the SingleViewCoreData.sqlite file. How can I achieve this?

Answer 1

This how I was able to solve the issue also this is all Swift 3.1
var pURL: URL?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
checkForOldStore()
return true
}
Then I edited the persistentStoreCoordinator section.
lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator = {
// The persistent store coordinator for the application. This implementation creates and returns a coordinator, having added the store for the application to it. This property is optional since there are legitimate error conditions that could cause the creation of the store to fail.
// Create the coordinator and store
let coordinator = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
// let url = self.applicationDocumentsDirectory.appendingPathComponent("SingleViewCoreData.sqlite")
let url = self.pURL // ADDED THIS CODE WHICH REPLACED CODE FROM ABOVE.
var failureReason = "There was an error creating or loading the application's saved data."
do {
try coordinator.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: url, options: [NSMigratePersistentStoresAutomaticallyOption: true,
NSInferMappingModelAutomaticallyOption: true])
} catch {
With the following code I first check if the old sqlite file exists with the checkForOldStore(). Note that I set the pURL to equal what the old setting was on the persistentStoreCoordinator if the file exists before calling the migrateStore(). And because the checkForOldStore() still runs every time the app starts and now that the file doesn't exists I set the pURL to the new file name.
func checkForOldStore() {
let path = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
let url = NSURL(fileURLWithPath: path)
let filePath = url.appendingPathComponent("SingleViewCoreData.sqlite")?.path
let fileManager = FileManager.default
if fileManager.fileExists(atPath: filePath!) {
print("FILE AVAILABLE")
pURL = self.applicationDocumentsDirectory.appendingPathComponent("SingleViewCoreData.sqlite")
migrateStore()
} else {
pURL = self.applicationDocumentsDirectory.appendingPathComponent("NewName.sqlite")
print("FILE NOT AVAILABLE")
}
}
At the end of the migrateStore() I call the remvoeOldDB for each of the old sqlite files.
func migrateStore() {
// migrate current store from one URL to another
// write out the current store URL before the migration
var storeURL: URL? = persistentStoreCoordinator.persistentStores.last?.url
print("Current Store URL (before migration): \(String(describing: storeURL?.description))")
// grab the current store
let currentStore: NSPersistentStore? = persistentStoreCoordinator.persistentStores.last
// create a new URL
let newStoreURL: URL? = applicationDocumentsDirectory.appendingPathComponent("NewName.sqlite")
// setup new options dictionary if necessary
// migrate current store to new URL
_ = try? persistentStoreCoordinator.migratePersistentStore(currentStore!, to: newStoreURL!, options: nil, withType: NSSQLiteStoreType)
// and to check we're on the new store, write out tha URL again
storeURL = persistentStoreCoordinator.persistentStores.last?.url
print("Current Store URL (after migration): \(String(describing: storeURL?.description))")
removeOldDB(itemName: "SingleViewCoreData", fileExtension: "sqlite")
removeOldDB(itemName: "SingleViewCoreData", fileExtension: "sqlite-shm")
removeOldDB(itemName: "SingleViewCoreData", fileExtension: "sqlite-wal")
}
func removeOldDB(itemName:String, fileExtension: String) {
let fileManager = FileManager.default
let nsDocumentDirectory = FileManager.SearchPathDirectory.documentDirectory
let nsUserDomainMask = FileManager.SearchPathDomainMask.userDomainMask
let paths = NSSearchPathForDirectoriesInDomains(nsDocumentDirectory, nsUserDomainMask, true)
guard let dirPath = paths.first else {
return
}
let filePath = "\(dirPath)/\(itemName).\(fileExtension)"
do {
try fileManager.removeItem(atPath: filePath)
} catch let error as NSError {
print(error.debugDescription)
}
}