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The method puts is Ruby s built-in method for printing objects to the screen Internally, puts calls the to s method of the Customer class to print out the names of Bob and Mary, our two Customer instances To demonstrate the metaprogramming capability Ruby provides, let s suppose we want to modify the Customer class so that we can set Bob and Mary as each other s spouse To achieve this, we simply use line 2 to add a spouse attribute accessor to the Customer class The code in line 2 will add two accessor methods, spouse and spouse=, to the Customer class A class member variable in a Ruby class is by default private and not accessible to the world outside of the class.

A common problem for programmers is handling inserts of new database rows and updates to existing rows. The code typically tests whether the operation is an insert or an update, then performs the appropriate operation. Because each table that Drupal uses is described using a schema, Drupal knows what fields a table has and what the default values are for each field. By passing a keyed array of fields and values to drupal_write_record(), you can let Drupal generate and execute the SQL instead of writing it by hand. Suppose you have a table that keeps track of your collection of giant bunnies. The schema hook for your module that describes the table looks like this: /** * Implements hook_schema(). */ function bunny_schema() { $schema['bunnies'] = array( 'description' => t('Stores information about giant rabbits.'), 'fields' => array( 'bid' => array( 'type' => 'serial', 'unsigned' => TRUE, 'not null' => TRUE, 'description' => t("Primary key: A unique ID for each bunny."), ), 'name' => array( 'type' => 'varchar', 'length' => 64, 'not null' => TRUE, 'description' => t("Each bunny gets a name."), ), 'tons' => array( 'type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'description' => t('The weight of the bunny to the nearest ton.'), ), ),

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To view all the playlists you have stored on your system or select a playlist for use, expand the Playlists node in the Navigation pane and then select the one you recently saved from the tree, as shown in Figure 21-8. There will be a whole collection of playlists already created by default on your system, based on criteria such as when the files were added to your library, their star ratings, and favorites (based on the number of times you have listened to the track). Also, it s worth noticing that you can create playlists of photos, video, and TV using the same technique. This is important since portable media devices are now capable of playing so much more than simple MP3 music files.

'primary key' => array('bid'), 'indexes' => array( 'tons' => array('tons'), ), ); return $schema; } Inserting a new record is easy, as is updating a record: $table = 'bunnies'; $record = new stdClass(); $record->name = t('Bortha'); $record->tons = 2; drupal_write_record($table, $record); // The new bunny ID, $record->bid, was set by drupal_write_record() // since $record is passed by reference. watchdog('bunny', 'Added bunny with id %id.', array('%id' => $record->bid)); // Change our mind about the name. $record->name = t('Bertha'); // Now update the record in the database. // For updates we pass in the name of the table's primary key. drupal_write_record($table, $record, 'bid'); watchdog('bunny', 'Updated bunny with id %id.', array('%id' => $record->bid)); Array syntax is also supported, though if $record is an array, drupal_write_record() will convert the array to an object internally.

In order to make the @spouse class member variable accessible to the world outside of the Customer class, we need the code in line 2 that adds the spouse and spouse= accessor methods to the Customer class With those accessor methods, we can set Mary as Bob s spouse, as line 12 shows When line 12 assigns the variable mary to the spouse attribute of bob, the spouse= method of bob will be invoked The spouse= method in Listing 8-4 is implemented in such a way that if Mary is Bob s spouse, then Bob is also set as Mary s spouse Notice that the code in Listing 8-4 is executed after Listings 8-3 and 8-2.

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