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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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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 new Models 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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Now that you have seen all of the property list classes, what can we do with them The collection property list classes (NSArray, NSDictionary) have a method called -writeToFile: atomically:, which writes the property lists to files. NSString and NSData also have a writeToFile:atomically: method, but it just writes out strings or blobs of data. So, we could load up an array with strings and then save it:

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 patterns For instance, you might want to create a handy reference application that lists all of the American Kennel Club (AKC) dog breeds The AKC divides all of the dog breeds into categories like herding group and sporting group, so we ll need an AKCGroup class to represent these groups Within each group there are a number of dog breeds, so we also have

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NSArray *phrase; phrase = [NSArray arrayWithObjects: @"I", @"seem", @"to", @"be", @"a", @"verb", nil]; [phrase writeToFile: @"/tmp/verbiage.txt" atomically: YES];

a Breed class to represent the breeds These straightforward Objective-C classes will be subclasses of NSManagedObject, and you tell Core Data how to persist them using entities

Now, look at the file /tmp/verbiage.txt, and you should see something like this:

Entities tell Core Data which classes we will need to persist In order to actually save objects in a persistent store and reconstitute them later, Core Data also needs to know what information must be saved for each object Therefore, in our data model, entities have attributes that describe each of the properties that will need to be persisted

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In all but the simplest of applications, there will also be relationships between the classes you define For instance, each AKCGroup will contain one or more Breed objects and every Breed will be in exactly one group The objects were modeled with entities, and how they are interrelated is modeled with relationships Entities can have relationships with other entities For instance, an apple and an orange are both types of fruit, a crate might hold one or more apples and oranges, and a fruit stand might contain one or more crates

< xml version="1.0" encoding="UTF-8" > <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <array> <string>I</string> <string>seem</string> <string>to</string> <string>be</string> <string>a</string> <string>verb</string> </array> </plist>

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This code, while a bit verbose, is exactly what we tried to save: an array of strings. These property list files can be arbitrarily complex, with arrays of dictionaries containing arrays of strings and numbers and dates. Xcode also includes a property list editor, so you can poke around plist files and modify them. If you look around the operating system, you ll find lots of property list files, like all of your preference files in Library/Preferences in your home directory and system configuration files like those in /System/Library/LaunchDaemons.

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