CoreData stack managing independent 2 NSManagedObjectContext instances
Objective-C Ruby
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SLCoreDataStack provides a CoreData stack managing two NSManagedObjectContext's for you:

  • SLCoreDataStack.backgroundThreadManagedObjectContext with NSPrivateQueueConcurrencyType: Perform any changes to any CoreData model you are making here with the -[NSManagedObjectContext performBlock:] API.
  • SLCoreDataStack.mainThreadManagedObjectContext with NSMainQueueConcurrencyType: Use this context for displaying models in your UI.
  • SLCoreDataStack keeps these contexts is sync by automatically merging changes between them.
  • SLCoreDataStack supports automatic database migrations. For example: If you have three different model versions, then you can provide one migration from version 1 to version 2 and one migration from version 2 to version 3. SLCoreDataStack will find and detect available migrations and migrate an existing database under the hood for you.

Check out this blog post on why we chose this NSManagedObjectContext concept.

Getting started

NSURL *location = ...; // url to database.sqlite
NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"MyModel" withExtension:@"momd"];

SLCoreDataStack *stack = [[SLCoreDataStack alloc] initWithType:NSSQLiteStoreType
    inBundle:[NSBundle mainBundle]];

Store the stack somewhere and make it accessible as needed. You are ready to go :)