CoreData Example Note app

Configurable Stack

ConfigurableCoreDataStack.m is a flexible class that allows you to create a core data stack based on a CoreDataStackConfiguration object. This allows you to easily create core data stacks to suit your needs.

// create configuration object
CoreDataStackConfiguration *config = [CoreDataStackConfiguration new];
config.dataFileNameWithExtension = @"MyDataFile.sqlite";
config.storeType = NSInMemoryStoreType;
config.modelName = @"JustANote";
config.appIdentifier = @"com.martinjnash.example.CoreDataNotes";
config.searchPathDirectory = NSApplicationSupportDirectory;

// init stack with configuration object
ConfigurableCoreDataStack *stack = [[ConfigurableCoreDataStack alloc] initWithConfiguration:config];
NSManagedObjectContext *context = stack.managedObjectContext;

I recommend creating another class and reutrning your app's various configurations from class methods. See ConfigurationCreator.m for an example of how to encapsulate this. Your code will be much cleaner and future you will be happy.

CoreDataStackConfiguration *config = [ConfigurationCreator inMemoryStackConfiguration];
ConfigurableCoreDataStack *stack = [[ConfigurableCoreDataStack alloc] initWithConfiguration:config];

Standard Stack (change or subclass)

See CoreDataStack.m for an example of how to setup your core data stack. This can be configured by changing the return values directly or by overriding them in a subclass to support your app's unique configuration.

There are two default store types. SQLite and in-memory. The in-memory store type can be used for unit tests, since state is not saved between launches.

This is not as flexible as the configurable stack. But can be enough for a simple app that doesn't require flexibility.

There's not much to it once you've customized the return values. Just create a stack with one of the following methods:

// sqlite
NSManagedObjectContext *moc = [[CoreDataStack sqliteStack] managedObjectContext];

// memory
NSManagedObjectContext *moc = [[CoreDataStack inMemoryStack] managedObjectContext];

Note: the class methods sqliteStack and inMemory stack do not return singletons. A new stack instance is created every time.