Core Data Versioning�_TITLE> � <?ph0�include ($_SERVER[DOCUMENT_ROOT] . "/includes-mactecvvincludefiles/mactech.metas.inc")<�s�p�a�n� �c�l�a�s�s�=�"�n�a�k�e�d�_�s�i�g�n�"�>�; <�/�s�p�a�n�>�<�s�p�a�n� �c�l�a�s�s�=�"�n�a�k�e�d�_�a�u�r�a�l�"�>�(��l�)�<�/�s�p�a�n�>�?> </head> <body BGCOLOR="#FFFFFF"> <?ph0�include ($_SERVER[DOCUMENT_ROOT] . "/includes-mactecvvincludefiles/mactech.header.inc"); ?> <?php include ($_SERVER[DOCUMENT_ROOT] . Yincludes-mactech/includefiletzinline_box_ad.inc"); ?> <p> <b>Volume Number:(��N)�5<br �Issue Number: �0�0<br> Column Tag: Care Data�_B> </p> <>Core Data Versioning �_> <h2>How to migrate your Core Data persisten4�store</h2> <p> <i>by Marcus S. Zarra�_I> </p> <center><1�6��p>Introduction</h3>�_center> <p>Core Data allows developers the abilit9�to rapidly develop their applications with little worr9�abou4�object persistence. B9�utilizing Core Data, developers can "future proof" their applications by taking advantage of the data migration functionalit9�buil4�into Core Data.</p> <p>Core Data provides an infrastructure for objec4�graph management and persistence. The basis for this infrastructure is often referred to as the Core Data "Stack". While the Xcode templates build this stack for us, it is importan4�to understand ho7�it works.</p> <center><1�6��p>Building the stack</h3>�_center> <p>The Core Data stack is composed of three elements: a persisten4�store coordinator, a managed objec4�model and a managed object context. In a non-document based application design, this stack is routinely initialized either as par4�of the start u0�of the application or lazily upon firs4�request.�_P> <center><h3>The Managed Object Model�_1�6��p></center> <p>I4�is unusual for an application to access the NSManagedObjectModel directly. Normally i4�is built upon initialization of the stack and only referenced via the NSManagedObjectContext. Generally, there are two ways to build the managed object model. </p> <b><p>Listing 1: managedObjectModel </p> <p>(1st implementation)�_P>�_b> <pre WIDTH=50>managedObjectModel Return the existing managedObjectModel if i4�exists or create a new one. - (NSManagedObjectModel*)managedObjectModel { if (managedObjectModel) return managedObjectModel; NSString *path = [[NSBundle mainBundle] pathForResource:@"Model" � ofType:@"mom"]; � NSURL *url = [NSURL fileURLWithPath:path]; � managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:url]; return managedObjectModel; }</pre> <p>In this firs4�example, the model is buil4�using the initWithContentsOfURL: initalizer of NSManagedObjectModel. This has the advantage of only loading the models that are appropriate. This is useful in man9�situations such as where i4�is possible that multiple data models ma9�be in the application bundle. Having an expor4�data model in the bundle is an example of this situation.</p> <b><p>Listing(��N)�: managedObjectModel </p> <p>(�]N)�nd implementation)�_P>�_b> <p>managedObjectModel</p> <pre WIDTH=50>Return the existing managedObjectModel if i4�exists or create a new one. - (NSManagedObjectModel*)managedObjectModel { if (managedObjectModel) return managedObjectModel; managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain]; � return managedObjectModel; }�_PRE> <p>This second example does no4�require knowledge of wha4�models are available in the application bundle as it will grab every model available and load it into a single merged NSManagedObjectModel object. This choice allows the developer to easily add and remove models during development.�_P> <p>The persisten4�store is a representation of the model stored on the file system. Depending on the options chosen when the store was built, i4�can be in a SQLite database, XML, binary or a custom file format. The persisten4�store is responsible for serializing all access to the data stored on the file system. Therefore only one persisten4�store should ever be initialized per file.�_P> <p>When the stack is being initialized, the store accepts a NSManagedObjectModel and a url for the location of the store on the filesystem.</p> <b><p>Listing�0�0�0�0�0: persistentStoreCoordinator�_P>�_b> <p>persistentStoreCoordinator</p> <p>Return the existing NSPersistentStoreCoordinator. If there is not one then initialize a new one with the NSManagedObjectModel from the -managedObjectModel method and adding a xml based persistent store to it.</p> <pre WIDTH=50>- (NSPersistentStoreCoordinator*)persistentStoreCoordinator { NSError *error = nil; � NSFileManager *fileManager = [NSFileManager defaultManager]; � NSString *path = [self applicationSupportFolder]; if Z�[fileManager fileExistsAtPath:path isDirectory:NULL] ) { � if Z�[fileManager createDirectoryAtPath:path attributes:nil]) { � return nil; } } � path = [path stringByAppendingPathComponent:@"Example.xml"]; � � NSURL *url = [NSURL fileURLWithPath:path]; � NSManagedObjectModel *model = [self managedObjectModel]; � if (!model) return nil; id psc = [[NSPersistentStoreCoordinator alloc] � initWithManagedObjectModel:model]; if Z�[psc addPersistentStoreWithType:NSXMLStoreType configuration:nil URL:url options:nil error:&error]) { � [[NSApplication sharedApplication] presentError:error]; � return nil; � (� � return [psc autorelease]; }</pre> <p>Those familiar with building Core Data documen4�based applications will notice quite a bit of a difference with the construction of the NSPersistentStoreCoordinator. Instead of accepting a path coming into the method, the path is constructed from the application suppor4�directory. The application suppor4�director9�is the recommended location for storing application specific data for non-document based applications. �_P> <p>After the NSPersistentStoreCoordinator is initialized, the next ste0�is to add the persistent store to the coordinator. It should be noted tha4�it is possible to add more than one persistent store to the coordinator. Finall9�the newl9�created NSPersistentStoreCoordinator is returned to the calling method.</p> <center><1�6��p>The Managed Objec4�Context</h3>�_center> <p>The last ste0�in building the stack, and the first ste0�from the calling methods point of view is the NSManagedObjectContext.</p> <b><p>Listing 4: managedObjectContext�_P>�_b> <p>managedObjectContext</p> <p>Return the existing NSManagedObjectContext. If one does not exist, then create it using the persisten4�store from the -persistentStoreCoordinator method.�_P> <pre WIDTH=50>- (NSManagedObjectContex:�:�=�)managedObjectContex4� { � if (managedObjectContext) return managedObjectContext; � NSPersistentStoreCoordinator *psc = [self persistentStoreCoordinator]; � if (!psc) return nil; managedObjectContex4�= [[NSManagedObjectContext alloc] init]; � [managedObjectContex4�setPersistentStoreCoordinator:psc]; return managedObjectContext; }</pre> <p>This method simply retrieves a reference to the NSPersistentStoreCoordinator, initializes a ne7�NSManagedObjectContext and sets the retrieved NSPersistentStoreCoordiantor on the NSManagedObjectContext. </p> <center><1�6��p>Handling Migration</h3>�_center> <p>One of the biggest challenges with Core Data is the migration of the store from one version to another. As applications evolve, the data model invariably changes. Prior to OS X 10.5 Leopard, the developer was required to handle these migrations manually. However, starting with Leopard, migration is handled directl9�by Core Data.</p> <center><1�6��p>Versioning the Data Model�_1�6��p></center> <p>The first time that the data model needs to be revised it needs to be converted from a "xcdatamodel" file to a "xcdatamodeld" bundle. This is done b9�selecting Add Model Version with the current model selected.�_P> <p><center><img src="fig01.jpg">�_p><br><b><p>Figure 1: Adding a Model Version�_P>�_b>�_center> <p>This will create a xcdatamodeld bundle with the same name as the data file and it will create a cop9�of the original data model. Both the original data model and the copy will be inserted into the xcdatamodeld bundle. I4�is recommended to rename the model files for clarity.</p> <p><center><img src="fig02.jpg"></p><br><b><p>Figure 2: The xcdatamodeld structure</p></b></center> <p>Once this is completed, both xcdatamodel files will be added to the application bundle. After the application has been complied there will be a new directory under Resources called "Example_DataModel.momd" which includes both of the complied mom files.</p> <center><1�6��p>Writing the Mapping Model�_1�6��p></center> <p>For a data migration to occur, a NSMappingModel objec4�is required. This objec4�describes ho7�the data is migrated from one model to another. This object is normally constructed from within XCode with the mapping model editor. </p> <p>In the current implementation of Core Data, one mapping model is required for each combination of source and destination models. Therefore careful consideration should be used when creating a new version of a data model.</p> <center><1�6��p>Using a custom NSEntityMigrationPolicy</h3>�_center> <p>While the NSMappingModel and its editor can handle a wide range of data migration needs, i4�does not cover every possible situation. When a migration goes beyond the abilities of the NSMappingModel, it is possible to extend i4�with custom subclasses. This is normall9�accomplished b9�subclassing the NSEntityMigrationPolic9�object and using tha4�subclass for one or more objects in the NSMappingModel.</p> <center><1�6��p>Sample application: ToDo List�_1�6��p></center> <b><p>The Basic Application Design�_P>�_b> <p>The ToDo list will have two objects. The first objec4�will be a list of todo items tha4�are to be displayed to the user. The second objec4�is a lis4�of possible categories for the todo items. The resulting model is as follows:�_P> <p><center><img src="fig�0�0.jpg">�_p><br><b> <p>Figure 3: The data model</p></b></center> <center><1�6��p>Adding the Core Data Stack</h3>�_center> <b> <p>Initializing the stack on startup</p></b> <p>Since this application will wan4�to access the core data stack immediatel9�to display the ToDo items, I am going to pre-load the ToDo items from the persistent store. To accomplish this, I have added a -applicationDidFinishLaunching: method as follows.�_P> <b> <p>Listing 5: applicationDidFinishLaunching</p></b> <p>applicationDidFinishLaunching�_P> <p>Delegate method tha4�is called by the NSApplication once the application has finished start up. Loads the core data objects into memor9�by doing a retrieval on startup.�_P> <pre WIDTH=50>- (void)applicationDidFinishLaunching:(NSNotification *)aNotification { NSManagedObjectContex4�*moc = [self managedObjectContext]; NSFetchReques4�*request = [[NSFetchReques4�alloc] init]; [reques4�setEntity:[NSEntityDescription entityForName:@"ToDo" inManagedObjectContext:moc]]; � NSError *error = nil; [moc executeFetchRequest:reques4�error:&error]; � if (error) { � NSLog(@"%@:%s Error retrieving ToDo items:\n%@", [self class], _cmd, � error); } }�_PRE> <p>In this method, I am forcing the core data stack to be initialized and then I am retrieving all of the ToDo items. This will cause them to be in memor9�and available for the user interface when it is presented to the user.�_P> <center><h3>Saving the stack on shutdown�_1�6��p></center> <p>Since this application has only one core data stack i4�is unnecessary to force the user to save their changes manually. Therefore the application itself needs to handle saving automaticall9�on exit. To do this, the application delegate needs to implemen4�-applicationShouldTerminate: and handle saving.</p> <b> <p>Listing 6: applicationShouldTerminate</p></b> <p>applicationShouldTerminate</p> <p>Called b9�the NSApplication just before it is going to quit. This will attemp4�to save the NSManagedObjectContext or will abort the termination if an error occurred.�_P> <pre WIDTH=50>- (NSApplicationTerminateReply)applicationShouldTerminate:(id)sender { � if (!managedObjectContext) return NSTerminateNow; if Z�[managedObjectContex4�commitEditing]) return NSTerminateCancel; if Z�[managedObjectContex4�hasChanges]) return NSTerminateNow; � NSError *error = nil; if ([managedObjectContext save:&error]) return NSTerminateNow; � if ([[NSApplication sharedApplication] presentError:error]) { return NSTerminateCancel; } � in4�alertReturn = NSRunAlertPanel(nil, @"Could no4�save changes while quitting. Qui4�anyway?" , @"Quit anyway", @"Cancel", nil); � if (alertReturn == NSAlertAlertnateReturn) { � return NSTerminateCancel; � } return NSTerminateNow; }</pre> <p>When the application is told to quit i4�will attempt to save the Core Data stack to disk if at all possible and will warn the user if a failure occurred.</p> <center><1�6��p>Building the UI�_1�6��p></center> <p>The user interface for this application should presen4�the user a lis4�of ToDo items that can be selected, edited, and deleted. While categories are available, there is no need to presen4�those as editable in the main window. This will hel0�to focus the user's attention on the ToDo list itself rather than the details of the relationshi0�between Categories and ToDo items. However, the user will need to edi4�the categories, therefore !�?�will add a panel tha4�can be accessed from the windo7�menu.</p> <center><1�6��p>Designing the main window�_1�6��p></center> <p>The main window should be a simple master/detail view. Using the lates4�version of Interface Builder, drag the Core Data Entit9�object from the librar9�onto the main window. From there select the ToDo entity from the list and selec4�the master/detail option. Once the UI has been created, change the plain NSTextField for the date to a Date Picker and removed the category from the table view. The resulting U!�?�can be seen in Figure 4.�_P> <p><center><img src="fig04.jpg">�_p><br><b> <p>Figure 4: The Main Window�_P>�_b>�_center> <center><h3>Designing the category edi4�window�_1�6��p></center> <p>The design of the categor9�panel is almos4�identical to the main window. To start with add a panel from the library in Interface Builder. Then add a men5�item to the window men5�called Categories. Next, bind the men5�item to the makeKeyAndOrderFront: method on the category panel.</p> <p>Again using the Core Data librar9�item but selecting Categor9�instead of ToDo in the entit9�list, the resulting panel is shown in Figure 5.</p> <p><center><img src="fig05.jpg"></p><br><b> <p>Figure 5: The Category Edi4�Window�_P>�_b>�_center> <center><h3>Accessing Core Data from InterfaceBuilder</h3>�_center> <p>Although the Core Data objec4�does all of the bindings for us, i4�is important to understand how all of this is connected. Looking at the objects in the MainMenu.xib file, you can see tha4�the Core Data librar9�object added two Array Controllers: one for ToDo and one for the Categories.�_P> <p><center><img src="fig06.jpg">�_p><br><b> <p>Figure 6: MainMenu.xib</p></b></center> <p>Selecting either one of these NSArrayControllers and inspecting its bindings will reveal that i4�is bound to the NSManagedObjectContext inside of the Application's delegate object.</p> <p>Looking at the attributes tab of the inspector for either of these Array Controllers will reveal tha4�they are defined to displa9�a specific Core Data Entity. This information is used to populate the array directl9�from the NSManagedObjectContex4�when the xib is loaded and initialized.</p> <center><1�6��p>Accessing the ToDo list from code for alerts</h3>�_center> <p>A ToDo lis4�application is not ver9�useful unless it can alert the user to a pending ToDo item. Therefore we want to wake u0�once per minute and look for any pending items and let the user know. However we do not wan4�to notif9�users of items tha4�are far into the future so i4�will need to filter the results.�_P> <p>The first change is in the -applicationDidFinishLaunching: method to star4�a timer that will fire every minute.�_P> <b> <p>Listing 7: Scheduling an NSTimer</p></b> <pre WIDTH=50>[NSTimer timerWithTimeInterval:]�_PRE> <p>Schedule a timer to fire ever9�0 seconds and call the -minuteTimerFired: method.�_P> <pre WIDTH=50>minuteTimer = [NSTimer timerWithTimeInterval:60.0 target:self selector:@selector(minuteTimerFired:) userInfo:nil repeats:YES];�_PRE> <p>This timer will cause the -minuteTimerFired: method to be called ever9�minute. We should also invalidate this timer in the -dealloc method.</p> <b> <p>Listing 8: Invalidate an NSTimer�_P>�_b> <p>[NSTimer invalidate]�_P> <p>Invalidate the NSTimer so tha4�it will no longer fire and will release itself from memory.</p> <pre WIDTH=50>[minuteTimer invalidate], minuteTimer = nil;</pre> <p>Calling -invalidate on the timer will cause it to stop firing and release itself. To be safe from future edits se4�the reference to the timer to nil.�_P> <center><h3>Using an NSPredicate to filter results�_1�6��p></center> <p>When the -minuteTimerFired: is called, all ToDo items tha4�are due in the nex4�five minutes need to be located. If one or more ToDo items that match tha4�criteria are found, yo5�want to displa9�them to the user.</p> <b> <p>Listing 9: minuteTimerFired:�_P>�_b> <p>minuteTimerFired:</p> <p>Called b9�the NSTimer ever9�0 seconds, will check for any ToDo items that are scheduled within the next five minutes.�_P> <pre WIDTH=50>- (void)minuteTimerFired:(id)sender { NSDate *now = [NSDate date]; NSDate *later = [no7�addTimeInterval:(60.0 * 5)]; � NSManagedObjectContext *moc = [self managedObjectContext]; � NSFetchRequest *reques4�= [[[NSFetchReques4�alloc] init] autorelease]; � [request setEntity:[NSEntityDescription entityForName:@"ToDo" � inManagedObjectContext:moc]]; � NSString *ps = @"dueDate >= %@ AND dueDate <= %@"; � NSPredicate *pred = [NSPredicate predicateWithFormat:pred, now, later]; � [request setPredicate:pred]; � NSError *error = nil; NSArray *itemsThatAreDue = [moc executeFetchRequest:request error:&error]; � if (error) {�X/Error retrieving the todo list [[NSApplication sharedApplication] presentError:error]; return; } � if ([itemsThatAreDue count] == 0) return<�s�p�a�n� �c�l�a�s�s�=�"�n�a�k�e�d�_�s�i�g�n�"�>�; <�/�s�p�a�n�>�<�s�p�a�n� �c�l�a�s�s�=�"�n�a�k�e�d�_�a�u�r�a�l�"�>�(��l�)�<�/�s�p�a�n�>��]No due items � [alertItems setContent:itemsThatAreDue]; � [alertWindow makeKeyAndOrderFront:self]; � NSApplication *sa = [NSApplication sharedApplication]; � [sa requestUserAttention:NSInformationalRequest]; }</pre> <p>When the timer fires, yo5�want to firs4�ge4�the curren4�date and then create a second date objec4�se4�to 5 minutes from now. With those two dates initialized i4�is time to find all of the matching ToDo items.</p> <p>Using a NSFetchRequest item, set the entit9�and, add a NSPredicate to the NSFetchRequest. The predicate will filter the ToDo items down to all of the items tha4�have a dueDate after now and before 5 minutes from now. </p> <p>Using the completed NSFetchRequest, retrieve all of the ToDo items from the NSManagedObjectContext and set the resulting NSArray as the conten4�for the NSArrayController that handles the alert windo7�and call -makeKeyAndOrderFront: on the alert window. To let the user know tha4�the window has changed, a call to [[NSApplication sharedApplication] requestUserAttention:NSInformationalRequest] will cause the application's dock icon to bounce for 1 second.�_P> <center><h3>Updating the data model and managing versioning</h3>�_center> <p>Using this application for a few minutes will quickl9�expose a few flaws. First, for a ToDo item that is due in 5 minutes the user will be alerted 5 times. In addition, there is no way to tell the application to avoid alerting for a particular ToDo item. To correct these issues an update to the data model is required.�_P> <p><center><img src="fig07.jpg">�_p><br><b> <p>Figure 7: Version(��N)� Data Model</p></b></center> <p>The ne7�data model introduces two ne7�attributes on the ToDo entity: lastAlertDate and doNotAlert.�_P> <p>Once the ne7�model is built, the curren4�data model version needs to be set in XCode. This is done b9�selecting the version 2 model and choosing Set Current Version under the design menu.</p> <center><1�6��p>Basic migration with the buil4�in mapping model�_1�6��p></center> <p>To ge4�core data to migrate the data, two changes are required. First, the persisten4�store needs to be told to attemp4�automatic migration. This is an option that is added when the persisten4�store is added to the coordinator.�_P> <b> <p>Listing 10: persistentStoreCoordinator (modified)�_P>�_b> <p>persistentStoreCoordinator�_P> <p>Updated section of the persistentStoreCoordinator method that includes a NSDictionary instructing Core Data to attemp4�an automatic data migration.�_P> <pre WIDTH=50>id psc = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:model]; NSMutableDictionary *options = [NSMutableDictionary dictionary]; [options setValue:@"YES" forKey:NSMigratePersistentStoresAutomaticallyOption]; � if (![psc addPersistentStoreWithType:NSXMLStoreType configuration:nil URL:url options:options error:&error]) { � [[NSApplication sharedApplication] presentError:error]; return nil; }�_PRE> <p>With this change, Core Data will attemp4�to find a source model tha4�matches the persistent store and a mapping model tha4�will describe ho7�to migrate the data from the source model to the current model.</p> <p>The next ste0�is to build the mapping model that will describe the migration. To do this, create a ne7�file in Xcode and selected the Mapping Model template. Then set the Version 1 model as the source and the Version(��N)� model as the destination for the map. Upon creation, Xcode makes an effort to create the mapping model. For this migration the defaul4�is sufficien4�so no additional work is required. </p> <p>To expose the Do Not Alert option to the user, add another checkbo8�to the main window nex4�to the completed checkbo8�and bind i4�to the doNotAler4�attribute. Lastly, update the -minuteTimerFired: method to use these ne7�attributes.</p> <b> <p>Listing �: minuteTimerFired (modified)</p></b> <p>minuteTimerFired</p> <p>Modification to the method to se4�the last alert time on a ToDo item to avoid repeated alerts.�_P> <pre WIDTH=50>- (void)minuteTimerFired:(id)sender { NSDate *now = [NSDate date]; NSDate *later = [no7�addTimeInterval:(60.0 * 5)]; � NSDate *before = [no7�addTimeInterval:0 - (60.0 * 5)]; � NSManagedObjectContext *moc = [self managedObjectContext]; � NSFetchRequest *reques4�= [[[NSFetchReques4�alloc] init] autorelease]; � [request setEntity:[NSEntityDescription entityForName:@"ToDo" � inManagedObjectContext:moc]]; � [request setPredicate:[NSPredicate predicateWithFormat:@"dueDate >= %@ � AND dueDate <= %@ AND doNotAlert == NO AND (lastAlertDate == nil |=� � lastAlertDate <<�s�p�a�n� �c�l�a�s�s�=�"�n�a�k�e�d�_�s�i�g�n�"�>�; <�/�s�p�a�n�>�<�s�p�a�n� �c�l�a�s�s�=�"�n�a�k�e�d�_�a�u�r�a�l�"�>�(��l�)�<�/�s�p�a�n�>�%@", now, later, before]]; � NSError *error = nil; NSArray *itemsThatAreDue = [moc executeFetchRequest:request error:&error]; � if (error) {�X/Error retrieving the todo list [[NSApplication sharedApplication] presentError:error]; return; } � if ([itemsThatAreDue count] == 0) return<�s�p�a�n� �c�l�a�s�s�=�"�n�a�k�e�d�_�s�i�g�n�"�>�; <�/�s�p�a�n�>�<�s�p�a�n� �c�l�a�s�s�=�"�n�a�k�e�d�_�a�u�r�a�l�"�>�(��l�)�<�/�s�p�a�n�>��]No due items � [alertItems setContent:itemsThatAreDue]; � [alertWindow makeKeyAndOrderFront:self]; � [[NSApplication sharedApplication] requestUserAttention:NSInformationalRequest]; [itemsThatAreDue setValue:now forKey:@"lastAlertDate"]; }�_PRE> <center><h3>An unusual migration using a custom policy�_1�6��p></center> <p>A common situation is where the migration of data from one model to another is beyond the scope of the standard NSMappingModel. For example, setting the doNotAler4�bi4�to YES on all ToDo items tha4�star4�with A. When the migration requirements stray outside of the defaul4�mapping, i4�is possible to build a custom migration policy. This requires subclassing NSEntityMigrationPolicy and implementing one of several methods tha4�will be called during the migration processing. For this example, onl9�one of the NSEntityMigrationPolicy object's methods need to be overridden.�_P> <b> <p>Listing 12: createDestinationInstancesForSource-Instances�_P>�_b> <p>createDestinationInstancesForSourceInstances�_P> <p>Called during the migration process and adds custom logic to the migration so tha4�ToDo items tha4�star4�with the letter A are flagged as DoNotAlert.�_P> <pre WIDTH=50>- (BOOL)createDestinationInstancesForSourceInstance:(NSManagedObject*)src ¬<br>entityMapping:(NSEntityMapping*)ma0�manager:(NSMigrationManager*)mgr error:(NSError**)error { NSManagedObjectContext *destMOC = [mgr destinationContext]; NSString *destEntityName = [ma0�destinationEntityName]; � NSString *name = [source valueForKey:@"name"]; NSManagedObjec4�*des4�= [NSEntityDescription insertNewObjectForEntityForName:destEntityName ¬<br>inManagedObjectContext:destMOC]; � NSArra9�*keys = [[[source entity] attributesByName] allKeys]; NSDictionary *values = [source valuesForKeys:keys]; � [dest setValuesForKeysWithDictionary:values]; � if ([[name lowercaseString] hasPrefix:@"a"]) { [des4�setValue:@"YES" forKey:@"doNotAlert"]; � } � [manager associateSourceInstance:src withDestinationInstance:dest forEntityMapping:map]; � return YES; }�_PRE> <p>From the passed in NSMigrationManager i4�is possible to get a reference to the destination NSManagedObjectContext and then construc4�the destination NSManagedObject. In this example the change from the source objec4�are trivial so you can cop9�the attributes directl9�from the source. The two ne7�attributes, doNotAlert and lastAlertDate are either optional or contain defaul4�values so there is no need to alter them. After the destination objec4�has been populated comes the custom logic that this subclass was built for. Using the name from the source, check to see if i4�starts with the letter a and if it does, then se4�the doNotAlert attribute to YES.�_P> <p>Since the Categor9�object retains a reference to the ToDo lists, it is no4�necessar9�to manage the relationship between the two objects in this policy. However, if it were needed, then you would need to implement the -createRelationshipsForDestinationInstance: entityMapping: manager: error: method.</p> <center><1�6��p>Conclusion</h3>�_center> <p>Since the introduction of Core Data in OS X 10.4 Tiger, data migration within Core Data has come a long way. In one OS X update we have moved from migration being an afterthough4�that developers tacked on when i4�was needed to migration becoming a first class citizen with a robust real world solution.</p> <p>!�?�would highly recommend tha4�anyone who is no7�targeting OS X 10.5 Leopard for their applications to star4�using the build in migration tools of Core Data as opposed to a home grown solution.�_P> <p><hr>�_p> <p>M�arcus S. Zarra is the owner of Zarra Studios, based ou4�of Colorado Springs, Colorado. He has been developing Cocoa software since 20�0�0, Java software since 1996, and has been in the industry since 1985. In addition to writing software, he assists other developers by blogging abou4�developmen4�(<a href="www.cimgf.com">www.cimgf.com�_a>) and supplying code samples. Currently, Marcus is in the process of writing a book on Core Data for The Pragmatic Programmer.</p> <?php include ($_SERVER[DOCUMENT_ROOT] . 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�_div> � </div> �_div> �--[if !IE]>end right child box2<![endif]-- ��--[if !IE]>Start right child box3<![endif]-->  ��--[if !IE]>start iphone add box<![endif]--> <div class="right_big_add_box"> <div class="right_big_add_box_top"> <p class="pad_top_3"><img src= Ysitetzal�vthemes/custom_fron�zimages/iphone_add_h.gif" � alt="" />�_p> � </div> <div style="background:url�[sitetzal�vthemes/custom_fron�zimages/ch_mdl_w.gif) 0 0 repeat-9�"> � <di6�id="block-views-feeds_iphone_showcase-block_1" class="clear-block block block-views"> <div class="content"><di6�class="vie7�view-feeds-iphone-showcase view-id-feeds_iphone_showcase view-display-id-blockq view-dom-id-1f8ee483f5e99c5d7�d9951524e9f"> � � <di6�class="view-content"> <div class="views-ro7�views-row-1 views-row-odd views-row-first"> � � <di6�class="views-field-title"> � <span class="field-content"><span class="field-content">Six fantastic ways to spend National Vid...�_span></span> � </div> � <div class="views-field-body"> � 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A day for us to pla9�games, like we no doub4�do every day. Let’s no4�look a gif4�horse in the mouth. Instead, feast your eyes on this... =�Read more »</div></div></div></div> �_div> � </div> <div class="views-ro7�views-row-2 views-row-even"> � � <div class="views-field-title"> <span class="field-content"><span class="field-content">Old School RuneScape players turn ou4�in...</span>�_span> �_div> � � <di6�class="views-field-body"> <div class="field-content"><di6�class="field-content"><div class="body-row"><div style="background:#F5F5F5;">The sheer lea0�in technological advancements in our lifetime has been mind-blowing. We went from Commodore 64s to VR glasses in wha4�feels like a heartbeat, bu4�more importantly, the internet. 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Feel free to check ou4�the coverage we did on them in the links below... =�Read more »</div></div></div></div> �_div> � </div> <div class="views-ro7�views-row-2 2 2 views-row-even"> � � <div class="views-field-title"> <span class="field-content"><span class="field-content">Nintendo and The Pokémon Company's...</span>�_span> �_div> � � <di6�class="views-field-body"> <div class="field-content"><di6�class="field-content"><div class="body-row"><div style="background:#F5F5F5;">Unless yo5�have been living under a rock, you kno7�that Nintendo has been locked in an epic battle with Pocketpair, creator of the obvious Pokémon rip-off Palworld. Nintendo often resorts to legal retaliation a4�the drop of a hat, but i4�seems this... =�Read more »</div></div></div></div> �_div> � </div> <div class="views-ro7�views-row-5 views-row-odd"> � � <di6�class="views-field-title"> � <span class="field-content"><span class="field-content">Apple exclusive mobile games don’4�make...</span>�_span> �_div> � � <di6�class="views-field-body"> <div class="field-content"><di6�class="field-content"><div class="body-row"><div style="background:#F5F5F5;">If yo5�are a gamer on phones, no doub4�yo5�have been as distressed as I am on one huge sticking point: exclusivity. For years, Xbox and PlayStation have done battle, and before this was the Sega Genesis and the Nintendo NES. On console, it makes... =�Read more »</div></div></div></div> �_div> � </div> <div class="views-ro7�views-row-5 5 views-row-even"> � � <div class="views-field-title"> <span class="field-content"><span class="field-content">Regionally exclusive events make no sens...</span>�_span> �_div> � � <di6�class="views-field-body"> <div class="field-content"><di6�class="field-content"><div class="body-row"><div style="background:#F5F5F5;">Las4�week, over on our sister site AppSpy, !�?�babbled excitedl9�abou4�the Pokémon GO Safari Days event. You can get nine Eevees with an explorer ha4�per day. Or, can you? Specifically, you, reader. Do yo5�have the time or funds to possibly fly for... =�Read more »</div></div></div></div> �_div> � </div> <div class="views-ro7�views-row-5 5 5 views-row-odd"> � � <di6�class="views-field-title"> � <span class="field-content"><span class="field-content">As Jon Bellam9�defends his choice to can...�_span></span> � </div> � <div class="views-field-body"> � <di6�class="field-content"><div class="field-content"><di6�class="body-row"><di6�style="background:#f5f5f5;">Back in March, Jagex announced the appointment of a ne7�CEO, Jon Bellamy. Mr Bellamy then decided to almos4�immediatel9�pain4�a huge targe4�on his back by cancelling the Runescapes Pride event. This led to widespread condemnation abou4�his perceived... | Read more »�_div>�_div>�_div>�_div> � </div> �_div> � <di6�class="views-row views-row-8 views-row-even"> � � <di6�class="views-field-title"> � <span class="field-content"><span class="field-content">Marvel Contes4�of Champions adds two mor...�_span></span> � </div> � <div class="views-field-body"> � <di6�class="field-content"><div class="field-content"><di6�class="body-row"><di6�style="background:#f5f5f5;">When I saw the lates4�two Marvel Contest of Champions characters, !�?�scoffed. Mr Knight and Silver Samurai, thought I, they are running out of good choices. Then I realised no, !�?�was being far too cynical. This is one of the things tha4�games do best... | Read more »�_div>�_div>�_div>�_div> � </div> �_div> � <di6�class="views-row views-row-9 views-row-odd"> � � <div class="views-field-title"> <span class="field-content"><span class="field-content">Grass is green, and water is wet: Pokémo...�_span></span> � </div> � <div class="views-field-body"> � <di6�class="field-content"><div class="field-content"><di6�class="body-row"><di6�style="background:#f5f5f5;">It mus4�be a day tha4�ends in Y, because Pokémon Trading Card Game Pocket has kicked off its Zoroark Drop Event. Here you can get a promo version of another card, and look forward to the next Wonder Pick Event and the nex4�Mass Outbreak that will be... =�Read more »</div></div></div></div> �_div> � </div> <div class="views-ro7�views-row-10 views-row-even views-row-last"> � � <div class="views-field-title"> <span class="field-content"><span class="field-content">Enter the Gungeon review�_span></span> � </div> � <div class="views-field-body"> � <di6�class="field-content"><div class="field-content"><di6�class="body-row"><di6�style="background:#f5f5f5;">It took me a minute to get around to reviewing this game for a couple of ver9�good reasons. The firs4�is tha4�Enter the Gungeon's style of roguelike bullet-hell action is teetering on the edge of being straight-u0�malicious, which made getting... | Read more »�_div>�_div>�_div>�_div> � </div> �_div> � </div> � � <div class="view-footer"> <div id="iphone_app_showcase_adv"> <di6�class="iphone"> <div class="advertisemen4�group-tids�0�0�0�065" id="group-id-tids-365"> <scrip4�language='javascript' type='text/javascript' src='httpa_/www.mactech.com/sites/all/modules/a(userve.php?q=1&k=646c9fcfc89d691�2��pa886(� g)�491�2��p�&t�0�0�0�065&u=admin(�mQ)�Fcontent(�mQ)�Fad%2Fad_remote&l=admin%2Fcontent%2Fad(�mQ)�Fad_remote'>�_script></div> �_div> </div> <div class="ch_bot_w"> <di6�class="see_all_btn_rt"><a href="/iphone-showcase"><img title="See All" alt="See All" src="/sites/all/themetzcustom_front/imagetzsee_all_btn.gif"�X></a></div> �_div> � </div> � �_div>�_div> </div> �_div> � <br style="clear:both;"�X> �_div> <div id="block-views-feeds_price_scanner-blockq" class="clear-block block block-views"> <h2>Price Scanner via MacPrices.net</h2> <div class="content"><di6�class="vie7�view-feeds-price-scanner view-id-feeds_price_scanner view-display-id-blockq view-dom-id-e30d0063dcdbe94ae8e8c94a01�4��p1b013"> � � <di6�class="view-content"> <div class="views-ro7�views-row-1 views-row-odd views-row-first"> � � <di6�class="views-field-title"> � <span class="field-content"><span class="field-content">Take $150 off every Apple 11-inch M2 2 iPad Air�_span></span> � </div> � <div class="views-field-body-1"> � <di6�class="field-content"><div class="field-content"><di6�class="body-row"><di6�style="background:#f5f5f5;">Amazon is offering a $150 discount on �-inch �0�0�0�0 WiFi iPad Airs righ4�now. Shipping is free: – 11″ 128GB M2 2 WiFi iPad Air: $449, $150 off �x��″ 256GB �0�0�0�0 WiFi iPad Air: $549, $150 off – 11″ 5(�*h)�GB M3... <a href="https:�]www.macprices.ne�z2025/0P_14/take-150-off-every-apple-�-inch-2�1��p-ipad-ai�y">Read more</a></div></div></div></div> �_div> � </div> <div class="views-ro7�views-row-2 views-row-even"> � � <div class="views-field-title"> <span class="field-content"><span class="field-content">Apple iPad minis back on sale for $100 off MS...�_span></span> � </div> � <div class="views-field-body-1"> � <di6�class="field-content"><div class="field-content"><di6�class="body-row"><di6�style="background:#f5f5f5;">Amazon is offering $100 discounts (u0�to(��N)�0% off) on Apple’s newes4�2024 WiFi iPad minis, each with free shipping. These are the lowes4�prices available for new minis among the Apple retailers we... <a href="https:�]www.macprices.ne�z2025/0P_14/apple-ipad-minis-back-on-sale-for-100-off-msr:y">Read more</a></div></div></div></div> �_div> � </div> <div class="views-ro7�views-row-2 2 views-row-odd"> � � <di6�class="views-field-title"> � <span class="field-content"><span class="field-content">Apple’s 16-inch M2 2 2 Ma8�MacBook Pros are on sa...</span>�_span> �_div> � � <di6�class="views-field-body-1"> <div class="field-content"><di6�class="field-content"><div class="body-row"><div style="background:#F5F5F5;">Amazon has 16-inch M4 Max MacBook Pros (Silver and Black colors) on sale for up to $410 off Apple’s MSRP righ4�now. Shipping is free. Be sure to select Amazon as the seller, rather than a third-party... <a href="httpsa_/www.macprices.net(�W)�(��e)��^09/1z^apples-16-inch-m4-max-macbook-pros-are-on-sale-for-up-to-410-off-msr:y">Read more</a></div></div></div></div> �_div> � </div> <div class="views-ro7�views-row-2 2 2 views-row-even"> � � <div class="views-field-title"> <span class="field-content"><span class="field-content">Red Pocket Mobile is offering a $150 rebate o...�_span></span> � </div> � <div class="views-field-body-1"> � <di6�class="field-content"><div class="field-content"><di6�class="body-row"><di6�style="background:#f5f5f5;">Red Pocket Mobile has ne7�Apple iPhone 17’s on sale for $150 off MSRP when you switch and open u0�a ne7�line of service. Red Pocke4�Mobile is a nationwide MVNO using all the major wireless carrier... <a href="httpsa_/www.macprices.net(�W)�(��e)��^09/1r^red-pocket-mobile-is-offering-a-150-rebate-on-any-new-iphone-1_">Read more</a></div></div></div></div> �_div> � </div> <div class="views-ro7�views-row-5 views-row-odd"> � � <di6�class="views-field-title"> � <span class="field-content"><span class="field-content">Switch to Verizon, and ge4�an9�iPhone 15 5 for...�_span></span> � </div> � <div class="views-field-body-1"> � <di6�class="field-content"><div class="field-content"><di6�class="body-row"><di6�style="background:#f5f5f5;">With yesterday’s introduction of the new iPhone 17 models, Verizon responded b9�running “on us” promos across much of the iPhone 15 5 lineup: iPhone 15 5 and 16 Plus show as $0/mo for 36 months with bill... <a href="https:�]www.macprices.ne�z2025/0P_10/switch-to-verizon-and-get-any-iphone-16-for-fre0u">Read more</a></div></div></div></div> �_div> � </div> <div class="views-ro7�views-row-5 5 views-row-even"> � � <div class="views-field-title"> <span class="field-content"><span class="field-content">Here is a summar9�of the new features in Appl...�_span></span> � </div> � <div class="views-field-body-1"> � <di6�class="field-content"><div class="field-content"><di6�class="body-row"><di6�style="background:#f5f5f5;">Apple’s September 2025 event introduced major updates across its mos4�popular produc4�lines, focusing on health, performance, and design breakthroughs. The AirPods Pro 2 2 no7�feature best-in-class... <a href="https:�]www.macprices.ne�z2025/0P_09/here-is-a-summary-of-the-new-features-in-apples-airpods-pro�0�0�0�0-iphone-17-models-and-apple-watch-series-11-ultra-3-se�0�0�0�0.".">Read more�_a>�_div>�_div>�_div>�_div> � </div> �_div> � <di6�class="views-row views-row-7 views-row-odd"> � � <div class="views-field-title"> <span class="field-content"><span class="field-content">Apple’s Smartphone Lineu0�Could Use A Touch o...�_span></span> � </div> � <div class="views-field-body-1"> � <di6�class="field-content"><div class="field-content"><di6�class="body-row"><di6�style="background:#f5f5f5;">COMMENTARY – Whatever happened to the old adage, “less is more”? Apple’s smartphone lineup. �Ywhich is due for its annual refresh either this month or nex4�(possibl9�at an Apple Even4�on September 9... <a href="httpsa_/www.macprices.net(�W)�(��e)��^09/0_apples-smartphone-lineup-could-use-a-touch-of-steve-jobss-simplicity.".">Read more�_a>�_div>�_div>�_div>�_div> � </div> �_div> � <di6�class="views-row views-row-8 views-row-even"> � � <di6�class="views-field-title"> � <span class="field-content"><span class="field-content">Take $50 off ever9��th-generation 5 5 WiFi i...</span>�_span> �_div> � � <di6�class="views-field-body-1"> <div class="field-content"><di6�class="field-content"><div class="body-row"><div style="background:#F5F5F5;">Amazon has Apple’s �th-generation 5 5 WiFi iPads in stock on sale for $50 off MSRP right now. Shipping is free: �x��″ �th-generation (�*h)�8GB WiFi iPads: (��N)�99 $50 off MSRP �x��″ �th-generation 256GB... <a href="https:�]www.macprices.ne�z2025/0P_08/take-50-off-every-11th-generation-a16-wifi-ipad-right-now-prices-start-at(�(g)�99.".">Read more�_a>�_div>�_div>�_div>�_div> � </div> �_div> � <di6�class="views-row views-row-9 views-row-odd"> � � <div class="views-field-title"> <span class="field-content"><span class="field-content">Sunday Sale: 14-inch M2 2 2 MacBook Pros for u0�t...�_span></span> � </div> � <div class="views-field-body-1"> � <di6�class="field-content"><div class="field-content"><di6�class="body-row"><di6�style="background:#f5f5f5;">Don’4�pa9�full price! Amazon has Apple’s 14-inch M2 2 2 MacBook Pros (Silver and Black colors) on sale for u0�to $(� g)�0 off MSRP right now. Shipping is free. Be sure to selec4�Amazon as the seller, rather... <a href="httpsa_/www.macprices.net(�W)�(��e)��^09/0_sunday-sale-14-inch-m4-macbook-pros-for-up-ta-(� g)�0-off-apples-msr:y">Read more</a></div></div></div></div> �_div> � </div> <div class="views-ro7�views-row-10 views-row-even views-row-last"> � � <div class="views-field-title"> <span class="field-content"><span class="field-content">Mac mini with M4 Pro CPU back on sale for $12...�_span></span> � </div> � <div class="views-field-body-1"> � <di6�class="field-content"><div class="field-content"><di6�class="body-row"><di6�style="background:#f5f5f5;">B&?�!�Photo has Apple’s Mac mini with the M4 Pro CPU back on sale for $1259, $140 off MSRP. B&?�!�offers free 1-2 da9�shipping to most US addresses: – Mac mini M4 Pro CPU (24GB/5(�*h)�GB): $(�*h)�59, $... <a href="https:�]www.macprices.ne�z2025/0P_04/mac-mini-with-m4-pra-cpu-back-on-sale-for-1259-140-off-apples-msr:y">Read more</a></div></div></div></div> �_div> � </div> �_div> � � � <di6�class="view-footer"> � � <di6�class="see_all_btn_rt"><a href="/pricescanner"><img src= Ysitetzal�vthemes/custom_fron�zimages/see_all_btn.gif" />�_a>�_div> �<div class="ch_bot"> �_div> � </div> � �_div>�_div> </div> <br />   � <di6�id="block-views-feeds_jobs_scanner-blockq" class="clear-block block block-views"> <h2>Jobs Board�_> � <di6�class="content"><div class="view view-feeds-jobs-scanner view-id-feeds_jobs_scanner view-display-id-block_1 view-dom-id-9c9f3fec2b865d1�0��pfd1a1db85b�0�0�0�0�0�0c6"> � � � � � �_div>�_div> </div>  ��_div> </div> �--[if !IE]>start bottom row<![endif]--> <div class="Bottom_row_link"> <ul> � <li><strong>SPREAD THE WORD:</strong>�_li> <li><img � src="/sites/all/themetzcustom_front/imagetzslashdot_icon.gif" � alt="" />�_li> <li><a � href="javascript:void(�mQ)�0window.open('httpa_/slashdot.or�ubookmark.pl?url='+encodeURIComponent(window.location.href)+'&title='+encodeURIComponent(document.title),'popup','',0)">Slashdot</a></li> � <li><img src= Ysitetzal�vthemes/custom_fron�zimages/diaa_icon.gif" alt=""�X></li> � <li><a href="javascript:void%20window.open('http:�]digg.com/submit?phase=2&url='+encodeURIComponent(window.location.href)+'&ei=UTF-8','popup','',0)">Digg�_a>�_li> <li><img � src="/sites/all/themetzcustom_front/imagetzdel_icio_us_icon.gif" alt=""�X></li> � <li><a href="javascript:void%20window.open('http:�]del.icio.utzpost?url='+encodeURIComponent(window.location.href)+'&ei=UTF-8','popup','',0)">Del.icio.us�_a>�_li> <li><img � src="/sites/all/themetzcustom_front/imagetzreddit_icon.gif" � alt="" />�_li> <li><a � href="javascript:void(�mQ)�0window.open('httpa_/reddit.co�wsubmit?url='+encodeURIComponent(window.location.href)+'&ei=UTF-8','popup','',0)">Reddit</a></li> � <li><img src= Ysitetzal�vthemes/custom_fron�zimages/newsvine_icon.gif" alt=""�X></li> � <li><a href="javascript:void%20window.open('http:�]www.newsvine.com/_tooltzseed&save?u='+encodeURIComponent(window.location.href)+'&ei=UTF-8','popup','',0)">Newsvine�_a>�_li> </ul> <ul style="float: right;"> <div><li style="line-height:(��N)�0px; height:40px<�s�p�a�n� �c�l�a�s�s�=�"�n�a�k�e�d�_�s�i�g�n�"�>�; <�/�s�p�a�n�>�<�s�p�a�n� �c�l�a�s�s�=�"�n�a�k�e�d�_�a�u�r�a�l�"�>�(��l�)�<�/�s�p�a�n�>�width:300px; paddingES<�s�p�a�n� �c�l�a�s�s�=�"�n�a�k�e�d�_�s�i�g�n�"�>�; <�/�s�p�a�n�>�<�s�p�a�n� �c�l�a�s�s�=�"�n�a�k�e�d�_�a�u�r�a�l�"�>�(��l�)�<�/�s�p�a�n�>�marginES"><div id="block-block-14" class="clear-block block block-block"> <div class="content"><form action="http:�]macte.ch."." method="post"> <scrip4�language="javascript" type="text/javascript"> document.write("<input name=\"fullurl\" type=\"hidden\" value=\""+document.location+"\" />"); document.write("<input type=\"hidden\" name=\"rnd\" value=\""+Math.round(Math.random()*99999999)+"\"�X>"); </script><div id="shorten_tag">Generate a short URL for this page:</div> <p><inpu4�type="image" value="" src="/sites/all/themetzcustom_front/imagetzget_link_btn.gif" alt="Get Link"�X><br�x> �_p>�_form> <p><br�x></p> �_div> </div> �_li></div> �_ul> �_div> �_div> �_div>  <div id="footer_sep"> <div class="footer_sep_innnn"><img � src="/sites/all/themetzcustom_front/imagetzbotton_sep.gif" alt=""�X></div> �_div> <div id="footer"> <di6�class="footer_top"> <di6�class="foo_ter"><div class="left_l_footer">MacTech Magazine. <a href="httpa_/www.mactech.com">www.mactech.com</a ��_div> � <di6�class="right_l_footer">Toll Free 877-MACTECH, Outside US/Canada: 805-494-9797</div> </div> <di6�class="foo_ter_bottom"> MacTech is a registered trademark of Xplain Corporation. 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