reversible migrations

CoreStore/Migrating/DataStack+Migration.swift

@@ -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 {
             

CoreStore/Setting Up/DataStack.swift

@@ -199,7 +199,7 @@ public final class DataStack {
                     configuration: configuration,
                     URL: fileURL,
                     options: [
-                        NSSQLitePragmasOption: ["WAL": "journal_mode"],
+                        NSSQLitePragmasOption: ["journal_mode": "WAL"],
                         NSInferMappingModelAutomaticallyOption: true,
                         NSMigratePersistentStoresAutomaticallyOption: automigrating
                     ]
@@ -254,7 +254,7 @@ public final class DataStack {
                             configuration: configuration,
                             URL: fileURL,
                             options: [
-                                NSSQLitePragmasOption: ["WAL": "journal_mode"],
+                                NSSQLitePragmasOption: ["journal_mode": "WAL"],
                                 NSInferMappingModelAutomaticallyOption: true,
                                 NSMigratePersistentStoresAutomaticallyOption: automigrating
                             ]
@@ -376,4 +376,16 @@ public final class DataStack {
     private let storeMetadataUpdateQueue = GCDQueue.createConcurrent("com.coreStore.persistentStoreBarrierQueue")
     private var configurationStoreMapping = [String: NSPersistentStore]()
     private var entityConfigurationsMapping = [String: Set<String>]()
+    
+    deinit {
+        
+        for store in self.coordinator.persistentStores {
+            
+            do {
+                
+                try self.coordinator.removePersistentStore(store)
+            }
+            catch _ { }
+        }
+    }
 }

CoreStoreDemo/CoreStoreDemo.xcodeproj/project.pbxproj

@@ -11,6 +11,7 @@
 		B503FAE01AFDC71700F90881 /* ObjectObserverDemoViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = B503FADC1AFDC71700F90881 /* ObjectObserverDemoViewController.swift */; };
 		B503FAE11AFDC71700F90881 /* Palette.swift in Sources */ = {isa = PBXBuildFile; fileRef = B503FADD1AFDC71700F90881 /* Palette.swift */; };
 		B503FAE21AFDC71700F90881 /* PaletteTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = B503FADE1AFDC71700F90881 /* PaletteTableViewCell.swift */; };
+		B50D67911B4BCFED00124277 /* OrganismV3ToV2.xcmappingmodel in Sources */ = {isa = PBXBuildFile; fileRef = B50D67901B4BCFED00124277 /* OrganismV3ToV2.xcmappingmodel */; };
 		B52977D91B120B80003D50A5 /* ObserversViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52977D81B120B80003D50A5 /* ObserversViewController.swift */; };
 		B52977DD1B120F3B003D50A5 /* TransactionsDemoViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = B52977DC1B120F3B003D50A5 /* TransactionsDemoViewController.swift */; };
 		B52977DF1B120F83003D50A5 /* MapKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = B52977DE1B120F83003D50A5 /* MapKit.framework */; };
@@ -96,6 +97,7 @@
 		B503FADC1AFDC71700F90881 /* ObjectObserverDemoViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ObjectObserverDemoViewController.swift; sourceTree = "<group>"; };
 		B503FADD1AFDC71700F90881 /* Palette.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Palette.swift; sourceTree = "<group>"; };
 		B503FADE1AFDC71700F90881 /* PaletteTableViewCell.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = PaletteTableViewCell.swift; sourceTree = "<group>"; };
+		B50D67901B4BCFED00124277 /* OrganismV3ToV2.xcmappingmodel */ = {isa = PBXFileReference; lastKnownFileType = wrapper.xcmappingmodel; name = OrganismV3ToV2.xcmappingmodel; path = "CoreStoreDemo/MIgrations Demo/OrganismV3ToV2.xcmappingmodel"; sourceTree = SOURCE_ROOT; };
 		B52977D81B120B80003D50A5 /* ObserversViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ObserversViewController.swift; sourceTree = "<group>"; };
 		B52977DC1B120F3B003D50A5 /* TransactionsDemoViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TransactionsDemoViewController.swift; sourceTree = "<group>"; };
 		B52977DE1B120F83003D50A5 /* MapKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = MapKit.framework; path = System/Library/Frameworks/MapKit.framework; sourceTree = SDKROOT; };
@@ -265,6 +267,7 @@
 				B5EE258B1B36E40D0000406B /* MigrationsDemoViewController.swift */,
 				B5F45A601B4AE5A700831F2F /* OrganismV2ToV3.xcmappingmodel */,
 				B560070E1B3EC90F00A9A8F9 /* OrganismV2ToV3MigrationPolicy.swift */,
+				B50D67901B4BCFED00124277 /* OrganismV3ToV2.xcmappingmodel */,
 			);
 			path = "Migrations Demo";
 			sourceTree = "<group>";
@@ -394,6 +397,7 @@
 				B5F45A611B4AE5A700831F2F /* OrganismV2ToV3.xcmappingmodel in Sources */,
 				B503FAE11AFDC71700F90881 /* Palette.swift in Sources */,
 				B503FAE21AFDC71700F90881 /* PaletteTableViewCell.swift in Sources */,
+				B50D67911B4BCFED00124277 /* OrganismV3ToV2.xcmappingmodel in Sources */,
 				B560070F1B3EC90F00A9A8F9 /* OrganismV2ToV3MigrationPolicy.swift in Sources */,
 				B503FADF1AFDC71700F90881 /* ListObserverDemoViewController.swift in Sources */,
 				B54AAD4F1AF4D26E00848AE0 /* AppDelegate.swift in Sources */,

CoreStoreDemo/CoreStoreDemo/MIgrations Demo/MigrationsDemoViewController.swift

@@ -170,7 +170,7 @@ class MigrationsDemoViewController: UITableViewController {
                 let navigationItem = self.navigationItem
                 navigationItem.leftBarButtonItem?.enabled = enabled
                 navigationItem.rightBarButtonItem?.enabled = enabled
-                navigationItem.backBarButtonItem?.enabled = enabled
+                navigationItem.hidesBackButton = !enabled
                 
                 if let tableView = self.tableView {
                     

CoreStoreDemo/CoreStoreDemo/MIgrations Demo/OrganismV3ToV2.xcmappingmodel/xcmapping.xml

@@ -0,0 +1,83 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE database SYSTEM "file:///System/Library/DTDs/CoreData.dtd">
+
+<database>
+    <databaseInfo>
+        <version>134481920</version>
+        <UUID>8160C973-F2E8-4296-AC28-7329092D6700</UUID>
+        <nextObjectID>106</nextObjectID>
+        <metadata>
+            <plist version="1.0">
+                <dict>
+                    <key>NSPersistenceFrameworkVersion</key>
+                    <integer>526</integer>
+                    <key>NSStoreModelVersionHashes</key>
+                    <dict>
+                        <key>XDDevAttributeMapping</key>
+                        <data>
+		0plcXXRN7XHKl5CcF+fwriFmUpON3ZtcI/AfK748aWc=
+		</data>
+                        <key>XDDevEntityMapping</key>
+                        <data>
+		qeN1Ym3TkWN1G6dU9RfX6Kd2ccEvcDVWHpd3LpLgboI=
+		</data>
+                        <key>XDDevMappingModel</key>
+                        <data>
+		EqtMzvRnVZWkXwBHu4VeVGy8UyoOe+bi67KC79kphlQ=
+		</data>
+                        <key>XDDevPropertyMapping</key>
+                        <data>
+		XN33V44TTGY4JETlMoOB5yyTKxB+u4slvDIinv0rtGA=
+		</data>
+                        <key>XDDevRelationshipMapping</key>
+                        <data>
+		akYY9LhehVA/mCb4ATLWuI9XGLcjpm14wWL1oEBtIcs=
+		</data>
+                    </dict>
+                    <key>NSStoreModelVersionHashesVersion</key>
+                    <integer>3</integer>
+                    <key>NSStoreModelVersionIdentifiers</key>
+                    <array>
+                        <string></string>
+                    </array>
+                </dict>
+            </plist>
+        </metadata>
+    </databaseInfo>
+    <object type="XDDEVMAPPINGMODEL" id="z102">
+        <attribute name="sourcemodelpath" type="string">CoreStoreDemo/MigrationDemo.xcdatamodeld/MigrationDemoV3.xcdatamodel</attribute>
+        <attribute name="sourcemodeldata" type="binary">YnBsaXN0MDDUAAEAAgADAAQABQAGBrMGtFgkdmVyc2lvblgkb2JqZWN0c1kkYXJjaGl2ZXJUJHRv
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 truncated
+</attribute>
+        <attribute name="destinationmodelpath" type="string">CoreStoreDemo/MigrationDemo.xcdatamodeld/MigrationDemoV2.xcdatamodel</attribute>
+        <attribute name="destinationmodeldata" type="binary">YnBsaXN0MDDUAAEAAgADAAQABQAGBW8FcFgkdmVyc2lvblgkb2JqZWN0c1kkYXJjaGl2ZXJUJHRv
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+    </object>
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+        <attribute name="mappingtypename" type="string">Undefined</attribute>
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+        <attribute name="destinationname" type="string">Organism</attribute>
+        <attribute name="autogenerateexpression" type="bool">1</attribute>
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+        <relationship name="attributemappings" type="0/0" destination="XDDEVATTRIBUTEMAPPING" idrefs="z106 z105 z104"></relationship>
+        <relationship name="relationshipmappings" type="0/0" destination="XDDEVRELATIONSHIPMAPPING"></relationship>
+    </object>
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+    </object>
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+        <attribute name="name" type="string">hasTail</attribute>
+        <relationship name="entitymapping" type="1/1" destination="XDDEVENTITYMAPPING" idrefs="z103"></relationship>
+    </object>
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+        <attribute name="name" type="string">hasHead</attribute>
+        <relationship name="entitymapping" type="1/1" destination="XDDEVENTITYMAPPING" idrefs="z103"></relationship>
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+</database>