ios - How do I set up Core Data lightweight migration using MagicalRecord?

Question

I have hit a brick wall trying to setup lightweight migration of Core Data using MagicalRecord. I have looked at all of the posts on this subject, using Google and SO. I understand how the persistentStoreCoordinator works and what the settings I am trying to make also do.

Here's my code:

AppDeligate.h

NSPersistentStoreCoordinator *persistentStoreCoordinator;

AppDelegate.m

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {

if (persistentStoreCoordinator != nil) {
    return persistentStoreCoordinator;
}

NSURL *storeUrl = [NSURL fileURLWithPath: [[self applicationDocumentsDirectory] stringByAppendingPathComponent: @"saori.sqlite"]];

// handle db upgrade
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
                         [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
                         [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil];

NSError *error = nil;
persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]];

if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:options error:&error]) {
    
    // Handle error
}

return persistentStoreCoordinator;

}

I'm getting the following errors, which I understand; what I don't know is where are these objects (I have looked in my app, and found nothing):

No visible @interface for 'AppDelegate' declares the selector 'applicationDocumentsDirectory' and

No visible @interface for 'AppDelegate' declares the selector 'managedObjectModel'

I have already created the stores:

xcdatamodeld

Most, if not all of the code I have looked at is similar; I don't know if MagicalRecord handles this for me or not because I can't find any docs that would indicate how to do this using MR. My question is: what do I have to do to make this work?

score 13 · Accepted Answer

MagicalRecord 的全部意义在于，这是为您管理的：

[MagicalRecord setupCoreDataStackWithAutoMigratingSqliteStoreNamed:####];

在此处查看有关核心数据堆栈设置的文档。

score 8 · Accepted Answer

确保检查所有这些内容：

在您的 AppDelegate.m 文件中：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    ...
    [MagicalRecord setupAutoMigratingCoreDataStack];
    ...
}

如果您尚未对模型进行版本控制：