Database Reference
In-Depth Information
var migrationMappingModel : NSMappingModel
if let mappingModel = mappingModel {
migrationMappingModel = mappingModel
} else {
var error : NSError ?
migrationMappingModel = NSMappingModel .
inferredMappingModelForSourceModel (
from, destinationModel: to, error: &error)!
}
// 3
let destinationURL = storeURL. URLByDeletingLastPathComponent
let destinationName = storeURL. lastPathComponent + "~" + "1"
let destination =
destinationURL!. URLByAppendingPathComponent (destinationName)
println ( "From Model: \(from. versionIdentifiers ) " )
println ( "To Model: \(to. versionIdentifiers ) " )
println ( "Migrating store \(storeURL) to \(destination) " )
println ( "Mapping model: \(mappingModel) " )
// 4
var error : NSError ?
let success =
migrationManager. migrateStoreFromURL (storeURL,
type: NSSQLiteStoreType ,
options: nil ,
withMappingModel:mappingModel,
toDestinationURL:destination,
destinationType: NSSQLiteStoreType ,
destinationOptions: nil ,
error:&error)
// 5
if success {
println ( "Migration Completed Successfully" )
var error : NSError ?
let fileManager = NSFileManager . defaultManager ()
fileManager. removeItemAtURL (storeURL, error: &error)
fileManager. moveItemAtURL (destination, toURL:
storeURL, error:&error)
} else {
NSLog ( "Error migrating \(error) " )
}
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