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Core Data
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Key Skills & Concepts
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Understanding Core Data s basics Creating a Core Data model Understanding how to load, fetch, and save a model s data Knowing where to obtain more Core Data information
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ith its release as part of the iPhone OS X 30 SDK, Core Data is arguably the best choice for persisting an application s data It is more robust than using properties and is easier than using SQLite You can visually lay out your application s data model, much as you would when using a database-modeling tool Moreover, it provides the infrastructure for managing the objects you create, freeing you from writing the typical object management code As this chapter will demonstrate, using Core Data is a natural choice for persisting an application s data Core Data allows you to focus on the application rather than on the code persisting the application s data
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Core Data in Brief
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Core Data is a framework used to easily manage an application s data objects Core Data consists of managed object models, managed object contexts, and persistent data stores A managed object model contains an object graph The object graph is a collection of objects and their relationships with one another You create a graph using Xcode s data modeler The data modeler is where you visually add entities and create relationships between them A managed object context contains the objects created from the entities in the managed object model A managed object context has a persistent store coordinator that manages one or more persistent stores A persistent data store persists objects created by the managed object context Although an application can have multiple persistent stores, in this chapter, you restrict yourself to one persistent store Figure 17-1 illustrates Core Data s architecture
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Creating a Model
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A model contains entities Entities contain attributes Relationships model how one or more entities relate to one another You model these concepts using Xcode s data modeler You add a model to your application by creating a file with an xcdatamodel extension through Xcode s New File dialog (Figure 17-2) It is best to place the model file in a project s Resources folder After creating the model, when you select the file, Xcode should automatically display the data modeler in the Editor window
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Core Data
Managed Objects Managed Objects Managed Object Context
Entities Entities Persistent Store Coordinator Managed Object Model
Persistent Store
Figure 17-1 Core Data s architecture (simplified)
Entities
Entities, represented by the NSEntityDescription class, are patterns describing NSManagedObject instances NSManagedObjects are what you persist For Core Data to know how to instantiate new object instances and persist the instances, it needs a pattern Entities in the model provide those
Figure 17-2 Creating a new Core Data model
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patterns For instance, you might have an application containing fruit stands, crates, apples, and oranges A fruit stand contains one or more crates A crate contains an apple and orange mixture You model these objects using entities
Try This
Adding Entities to a Core Data Model
In this first task, you add entities to a data model There is nothing to run in this task, as you will add attributes and relationships, generate classes, and then write the code to manage the object model in future tasks In this task, you simply create entities in the data modeler
1 Create a new View-based Application named FruitStand 2 Add the CoreDataframework framework to your project s frameworks 3 Add a new NSObject named FruitStand to the project 4 Add an NSMutableArray to FruitStand as a property Name the property crates Add
another NSString property named standName Do not forget to synthesize both properties in FruitStand s implementation Save or compile the application
5 Add a new data model to Resources by selecting File | New File and then selecting Data
Model Click Next Name the data model FruitStandModel Click Next
6 The next dialog asks you if you wish to add any pre-existing objects to the data model Add
FruitStand (Figure 17-3)
Figure 17-3 Adding FruitStand to data model
17:
Core Data
Figure 17-4 FruitStand added to the data model
7 Xcode adds the FruitStand class, and its attributes, to the newly created data model
(Figure 17-4)
8 Create a new entity called Crate, a new entity called Apple, and one called Orange Also,
add an entity named Fruit (Figure 17-5) You create a new entity by control-clicking in the model and selecting Add Entity, or by clicking the plus sign at the bottom of the entity pane
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