What are relationships in Core Data?
Inverse relationships enable Core Data to propagate change in both directions when an instance of either the source or destination type changes. Every relationship must have an inverse. When creating relationships in the Graph editor, you add inverse relationships between entities in a single step.
How does Core Data work in iOS?
Core Data is a framework that you use to manage the model layer objects in your application. It provides generalized and automated solutions to common tasks associated with object life cycle and object graph management, including persistence.
How many types of Core Data are there?
Python Data Types are mainly of 3 types: Boolean, integer, and string. These may also be called the core data types in Python.
What is abstract entity in Core Data?
Abstract Entities Specify that an entity is abstract if you will not create any instances of that entity. You typically make an entity abstract if you have a number of entities that all represent specializations of (inherit from) a common entity that should not itself be instantiated.
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 are Core Data types?
In the Programming context, a Data Type may be defined as a classification that specifies which type of value a variable has, and what type of mathematical, relational, or logical operations can be applied to it without causing an error.
Can Core Data store an array?
There are two steps to storing an array of a custom struct or class in Core Data. The first step is to create a Core Data entity for your custom struct or class. The second step is to add a to-many relationship in the Core Data entity where you want to store the array.
What is transient property in Core Data?
Transient attributes are properties that you define as part of the model, but that are not saved to the persistent store as part of an entity instance’s data. Core Data does track changes you make to transient properties, so they are recorded for undo operations.