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block. Blocks that are dynamic in nature, related to a module you ve written, or that consist of mostly PHP code are excellent candidates for using the block API and for being implemented within a module. Try to avoid storing PHP code in custom blocks, as code in the database is harder to maintain than code written in a module. A site editor can come along and accidentally delete all that hard work too easily. Rather, if it doesn t make sense to create a block at the module level, just call a custom function from within the block and store all that PHP code elsewhere.

Tip A common practice for blocks and other components that are site-specific is to create a site-specific module and place the custom functionality for the site inside that module. For example, the developer of a web site for the Jones Pies and Soda Company may create a jonespiesandsoda module.

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This completes the Shapes application. Build it, run it, tap it, rotate it, shake it. You should see shapes appear, change colors, and disappear. Through the easy Core Data interface, you can create, retrieve, update, and delete data from your persistent store. If you have any problems building or running the Shapes application, check the accuracy of your data model and also of your code. The complete source code of the Shapes application is available online at http://apress.com/book/sourcecode. The next section enhances the Shapes application by adding custom data objects instead of using NSManagedObject instances. In the typical life cycle of a Core Data-enabled application, you will likely start by using NSManagedObject. As your application evolves, you will eventually feel the need to introduce custom data objects for code clarity and maintainability.

Although the block API is relatively simple, don t disregard the complexity of what you can do within that framework. Blocks can display just about anything you want (that is, they are written in PHP and thus are not limited in what they can do), but they usually play a supporting role to the main content of the site. For example, you could create a custom navigation block for each user role, or you could expose a block that lists comments pending approval.

$salt = substr(md5(time()), 0, 7); // create a random salt $hash = $salt . sha1($salt . $password);

This is the first time in this book that we are on the verge of enhancing our managed objects to a level that makes them truly blend with the rest of your code. Core Data gives you so much flexibility to implement your own managed objects that you can almost completely hide the fact that they are backed by the framework. In this section, we rework the Shapes application in order to use custom managed objects. The first step is to create the data object classes themselves. You can create them manually or let Xcode generate them for you. Getting Xcode to generate them for you involves a bit of trickery: open your data model (Shapes.xcdatamodel) and click somewhere on the background, outside any of the entities. Now select File New File , select Cocoa Touch Class under iOS on the left, and you should see a new option on the right: Managed Object Class, as shown in Figure 5-8. Select it and click Next. In the ensuing dialog, set the Location field to save the classes into your project s Classes directory and click Next. You then have the opportunity to select any or all of your model s entities and generate classes for them, as shown in Figure 5-9. Once you ve selected what you want, which for our purposes is all of them, click Finish, and the classes are generated.

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