What is NSManagedObjectModel in Swift?
What is NSManagedObjectModel in Swift?
NSManagedObjectModel provides an API to retrieve a stored fetch request by name, and to perform variable substitution—see fetchRequestTemplate(forName:) and fetchRequestFromTemplate(withName:substitutionVariables:) . You typically define fetch request templates using the Data Model editor in Xcode.
What is viewContext Swift?
The main queue’s managed object context.
What is NSFetchRequest?
A description of search criteria used to retrieve data from a persistent store.
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.
What is Persistentcontainer in Swift?
NSPersistentContainer simplifies the creation and management of the Core Data stack by handling the creation of the managed object model ( NSManagedObjectModel ), persistent store coordinator ( NSPersistentStoreCoordinator ), and the managed object context ( NSManagedObjectContext ).
What is NSPredicate in Swift?
A definition of logical conditions for constraining a search for a fetch or for in-memory filtering. iOS 3.0+
What is Persistentcontainer Swift?
What is entity in Core Data?
An entity description describes an entity (which you can think of as a table in a database) in terms of its name, the name of the class used to represent the entity in your application, and what properties (attributes and relationships) it has.
How does the NSManagedObjectModel object know about the data model?
The NSManagedObjectModel object knows about the data model by loading one or more data model files during its initialization. We’ll take a look at how this works in a few moments.
How do I create an object model in Xcode?
You typically create managed object models using the data modeling tool in Xcode, but it’s possible to build a model programmatically if needed. Managed object model files are typically stored in a project or a framework. To load a model, you provide an URL to the constructor.
What is the managed object model in core data?
The managed object model represents the data model of the application. Even though Core Data isn’t a database, you can compare the managed object model to the schema of a database, that is, it contains information about the models or entities of the object graph, what attributes they have, and how they relate to one another.
What is the nspersistentstorecoordinator object?
As its name indicates, the NSPersistentStoreCoordinator object persists data to disk and ensures the persistent store (s) and the data model are compatible. It mediates between the persistent store (s) and the managed object context (s) and also takes care of loading and caching data. That’s right. Core Data has caching built in.