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All of our examples in previous chapters have used instances of NSMutableDictionary in the place of real model objects. What do we mean by real model objects Well, besides just being able to hold onto pieces of data, which are accessible using field names or keys (something that NSMutableDictionary does well enough), real model objects should include some of the following features: Archiving. Model objects should have access to a built-in mechanism for being saved to disk, and later reloaded. Business Logic. There should be a way to give a model object custom behavior that operates in response to input values. Validation. Each model object should be able to automatically validate input values.
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CHAPTER 7: Core Data Basics
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Figure 7 1. The MythBase application, in all its glory
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In the past, Mac application developers following MVC principles would typically have to roll their own solutions for these common needs, but Core Data provides all of this and more. Besides the features listed previously, Core Data also provides additional key features: Undo/redo support. Core Data s mechanisms for handling values are tied into the standard Undo facility in Mac OS X. Having this built in to your model classes saves you the additional effort of implementing this common functionality yourself.
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CHAPTER 7: Core Data Basics
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Integration with Cocoa Bindings. Together with Cocoa Bindings, Core Data provides you with a mechanism for connecting views to models using generic controller objects, thereby eliminating a lot of boring glue code. Taken together, all of these features provide the core of your application with some sturdy infrastructure. You can use Core Data to build GUI apps (with or without Cocoa Bindings), command-line tools, games, or any other sort of software system that can be specified using traditional object modeling techniques. In other words, almost any application at all.
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Creating MythBase
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Now, let s get started creating MythBase, a GUI application that lets us maintain a database of mythological figures. We ll use Core Data for the model layer, and Cocoa Bindings to handle most of the controller functionality. There will be some new concepts and terminology to tackle, and we ll cover each piece as we get to it. In the first iteration, we ll define a model for our application using a special tool inside Xcode, and create a simple GUI using an assistant in Xcode. In the second iteration, we ll refine the GUI to improve the user experience a bit. Then, after explaining some other aspects of the application, we ll take a third pass at the functionality, adding some business logic to the application s model layer. Start by creating a new application project. In Xcode, choose File New Project, then select Application on the left side of the window. Click to turn on the Use Core Data for storage checkbox (see Figure 7 2), and then click Choose. This procedure is slightly different for Xcode versions prior to 3.2, on Mac OS X 10.5 and earlier, where Core Data Application appears as a separate project type. Navigate to the directory where you want to save your new project, and enter MythBase as the project s name. Now that the project is created, we need to prepare it for garbage collection in the usual way. Select the top-level MythBase group in the navigation pane, and open the Info window by pressing I. Switch to the Build tab, select All Configurations in the Configuration popup, then start typing garbage in the search field to the right. When the Objective-C Garbage Collection item is shown, click the popup containing its value on the right and change it to Required.
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CHAPTER 7: Core Data Basics
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Figure 7 2. Creating a new application project, and turning on the Core Data option
Defining the Model
At this point, you ll have a brand-new project, similar to the ones you ve created before. Choosing to use Core Data causes Xcode to use a slightly different project template, so this project will have a thing or two you haven t seen in your old projects. In Xcode s navigator pane, you ll find a new top-level group called Models; inside that, you ll see the project s default empty model file, called MythBase_DataModel.xcdatamodel. A model file contains metadata about your application s model layer. You create the model file using a graphical tool built into Xcode, and your application reads the model file at runtime.
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