What is managed object model?
What is managed object model?
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 managed object context in IOS?
A managed object context is an instance of NSManagedObjectContext . Its primary responsibility is to manage a collection of managed objects. These managed objects represent an internally consistent view of one or more persistent stores.
What is Nsfetchrequest in Swift?
A description of search criteria used to retrieve data from a persistent store.
Is managed object context thread safe?
Managed Object Context The NSManagedObjectContext class isn’t thread safe.
What is NSEntityDescription in Swift?
An NSEntityDescription object is associated with a specific class whose instances are used to represent entries in a persistent store in applications using the Core Data Framework. Minimally, an entity description should have: A name. The name of a managed object class.
What is NSManagedObjectModel in Swift?
NSManagedObjectModel represents your application model file describing your app’s types, properties, and relationships. NSManagedObjectContext tracks changes to instances of your application types. NSPersistentStoreCoordinator used to saves and fetch instances of your application types from stores.
What is managed object Core Data?
Core Data uses a schema called a managed object model — an instance of NSManagedObjectModel . In general, the richer the model, the better Core Data is able to support your application. A managed object model allows Core Data to map from records in a persistent store to managed objects that you use in your application.
What is single managed object?
A single managed object instance exists in one and only one context, but multiple copies of an object can exist in different contexts. Therefore, an object is unique to a particular context.
What is an Nsmanagedobjectid?
A compact, universal identifier for a managed object.
Can we have multiple managed object context 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.
What is Core Data stack in IOS?
A Core Data stack is composed of the following objects: one or more managed object contexts connected to a single persistent store coordinator which is in turn connected to one or more persistent stores. A stack contains all the Core Data components you need to fetch, create, and manipulate managed objects.
What is NSPersistentStoreCoordinator in IOS?
A persistent store coordinator is an instance of NSPersistentStoreCoordinator . It has a reference to a managed object model that describes the entities in the store or stores it manages. The coordinator is the central object in a Core Data stack.
