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reversible migrations

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This commit is contained in:
John Estropia
2015-07-07 19:38:46 +09:00
parent 5b85b0749e
commit 5f04f4c496
5 changed files with 130 additions and 23 deletions
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48
CoreStore/Migrating/DataStack+Migration.swift
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@@ -446,6 +446,18 @@ public extension DataStack {
private func startMigrationForSQLiteStore(fileURL fileURL: NSURL, sourceModel: NSManagedObjectModel, destinationModel: NSManagedObjectModel, mappingModel: NSMappingModel) throws {
autoreleasepool {
let journalUpdatingCoordinator = NSPersistentStoreCoordinator(managedObjectModel: sourceModel)
let store = try! journalUpdatingCoordinator.addPersistentStoreWithType(
NSSQLiteStoreType,
configuration: nil,
URL: fileURL,
options: [NSSQLitePragmasOption: ["journal_mode": "DELETE"]]
)
try! journalUpdatingCoordinator.removePersistentStore(store)
}
let migrationManager = NSMigrationManager(
sourceModel: sourceModel,
destinationModel: destinationModel
@@ -475,21 +487,18 @@ public extension DataStack {
withIntermediateDirectories: true,
attributes: nil
)
let temporaryFileURL = temporaryDirectoryURL.URLByAppendingPathComponent(fileURL.lastPathComponent!, isDirectory: false)
do {
try migrationManager.migrateStoreFromURL(
fileURL,
type: NSSQLiteStoreType,
options: [
NSSQLitePragmasOption: ["WAL": "journal_mode"]
],
options: nil,
withMappingModel: mappingModel,
toDestinationURL: temporaryDirectoryURL.URLByAppendingPathComponent(fileURL.lastPathComponent!, isDirectory: false),
toDestinationURL: temporaryFileURL,
destinationType: NSSQLiteStoreType,
destinationOptions: [
NSSQLitePragmasOption: ["WAL": "journal_mode"],
NSSQLiteManualVacuumOption: true
]
destinationOptions: nil
)
}
catch {
@@ -515,20 +524,19 @@ public extension DataStack {
do {
let originalDirectoryURL = fileURL.URLByDeletingLastPathComponent!
for temporaryFileURL in try fileManager.contentsOfDirectoryAtURL(temporaryDirectoryURL, includingPropertiesForKeys: nil, options: .SkipsSubdirectoryDescendants) {
try fileManager.replaceItemAtURL(
fileURL,
withItemAtURL: temporaryFileURL,
backupItemName: nil,
options: [],
resultingItemURL: nil
)
do {
try fileManager.replaceItemAtURL(
originalDirectoryURL.URLByAppendingPathComponent(
temporaryFileURL.lastPathComponent!,
isDirectory: false
),
withItemAtURL: temporaryFileURL,
backupItemName: nil,
options: [],
resultingItemURL: nil
)
try fileManager.removeItemAtPath(fileURL.path! + "-shm")
}
catch _ { }
}
catch {