What is a managed object context?

What is a managed object context?

A managed object context represents a single object space, or scratch pad, in a Core Data application. A managed object context is an instance of NSManagedObjectContext . It’s the object you use to create and fetch managed objects, and to manage undo and redo operations.

Can we have more than one managed object context?

You do not need two managed object contexts for that to work successfully. You can however create a private thread to manage the persistence process (i.e. saving data) so as not to block the User Interface.

What is managed object in Core Data?

A managed object model is a set of objects that together form a blueprint describing the managed objects you use in your application. A model allows Core Data to map from records in a persistent store to managed objects that you use in your application.

What is an Nsmanagedobjectid?

A compact, universal identifier for a managed object.

Can we have multiple managed object contexts in Core Data?

Most apps need just a single managed object context. The default configuration in most Core Data apps is a single managed object context associated with the main queue. Multiple managed object contexts make your apps harder to debug; it’s not something you’d use in every app, in every situation.

Is Core Data a Threadsafe?

Core Data is designed to work in a multithreaded environment. However, not every object under the Core Data framework is thread safe. To use Core Data in a multithreaded environment, ensure that: Managed object contexts are bound to the thread (queue) that they are associated with upon initialization.

Is NSManagedObject thread safe?

The NSManagedObject class is not thread-safe. The Core Data framework provides a solution to pass managed objects from one thread to another, the NSManagedObjectID class. An instance of this class uniquely identifies a managed object in an application.

Is NSSet thread safe?

The documentation on NSSet objectEnumeration says: When this method is used with mutable subclasses of NSSet, your code shouldn’t modify the set during enumeration. If you intend to modify the set, use the allObjects method to create a “snapshot” of the set’s members.

What is persistent container in iOS?

A container that encapsulates the Core Data stack in your app. iOS 10.0+ macOS 10.12+