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A common configuration option that you ll want to become familiar with is setting the block visibility options on the configuration page for a block. Block visibility defines when a block should and should not be displayed on a page based on criteria you specify using the interface shown in Figure 10-2. Using the User Login block as an example, you can control whether the block is displayed through the following options: Page-specific visibility settings: Administrators can choose to make a block be visible or hidden on a certain page or range of pages or when your custom PHP code determines that certain conditions are true. Content types visibility settings: Administrators can choose to display this block only on pages that display a specific content type for example, display this block only if the page displays a forum topic. Role-specific visibility settings: Administrators can choose to make a block be visible to only those users within certain roles. User-specific visibility settings: Administrators can allow individual users to customize the visibility of a given block for that user within his or her account settings. Users would click their My account link to modify block visibility.

I mentioned previously that the block administration page gives site administrators a choice of regions where blocks can appear. On the same page, they can also choose in what order the blocks are displayed within a region, as shown in Figure 10-1. Regions are defined by the theme layer in the theme s .info

To keep the code organized, a good practice is to create a group of classes where you will store your data objects. In Xcode, right-click the Classes group, and select New Group. Rename the new group to Managed Objects and drag all the newly generated classes to it. Figure 5-10 shows what your source tree should look like.

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The preceding code generates a random seven-digit salt. The salt is prepended to the password string before hashing; this means that even if two users have the same password, their individual password hashes will be different. However, in order to reproduce that hash, the salt needs to be available. For this reason, the salt is also prepended, unencrypted, to the hash. This way, when a user signs in, you re able to extract the salt from the hash when it s retrieved from the database and use it to recreate the salted hash of the user s password:

file, rather than through the block API, and different themes may expose different regions. Please see 8 for more information on creating regions.

Besides generating the classes, Xcode also updates the class for the entities in your data model from NSManagedObject to the newly generated class.

Blocks are defined within modules by using hook_block_info(), and a module can implement multiple blocks within this single hook. Once a block is defined, it will be shown on the block administration page. Additionally, a site administrator can manually create custom blocks through the web interface. In this section, we ll mostly focus on programmatically creating blocks. Let s take a look at the database schema for blocks, shown in Figure 10-3.

$salt = substr($dbhash, 0, 7); // extract salt from stored hash $hash = $salt . sha1($salt . $_POST['password']); if ( $dbhash==$hash ) { echo "Match!"; } else { echo "No match."; }

Figure 10-3. Database schema for blocks Block properties for every block are stored in the blocks table. Additional data for blocks created from within the block configuration interface is stored in other supporting tables, as listed in Figure 10-3. The following properties are defined within the columns of the block table: bid: This is the unique ID of each block. module: This column contains the name of the module that defined the block. The user login block was created by the user module, and so on. Custom blocks created by the administrator at Structure -> Blocks -> Add Blocks are considered to have been created by the block module. delta: Because modules can define multiple blocks within hook_block_info(), the delta column stores a key for each block that s unique only for each implementation of hook_block_info(), and not for all blocks across the board. A delta should be a string.

To perform the same task manually, without having Xcode generate your classes, you would do two things: 1. 2. Create the code for the class (open any of the new files to see examples) Update the Class field for the entity in your data model to point to the new class

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