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Table of Contents
CakePHP allows you to set up a combination of controllers, models, and views and release them as a packaged application plugin that others can use in their CakePHP applications. Have a sweet user management module, simple blog, or web services module in one of your applications? Package it as a CakePHP plugin so you can pop it into other applications.
The main tie between a plugin and the application it has been installed into is the application's configuration (database connection, etc.). Otherwise, it operates in its own little space, behaving much like it would if it were an application on it's own.
As a working example, let's create a new plugin that orders pizza
for you. What could be more useful in any CakePHP application? To start
out, we'll need to place our plugin files inside the
/app/plugins folder. The name of the parent folder
for all the plugin files is important, and will be used in many places, so
pick wisely. For this plugin, let's use the name 'pizza'. This is how the
setup will eventually look:
Example 13.1. Pizza Ordering Filesystem Layout
/app
/plugins
/pizza
/controllers <- plugin controllers go here
/models <- plugin models go here
/views <- plugin views go here
/pizza_app_controller.php <- plugin's AppController, named after the plugin
/pizza_app_model.php <- plugin's AppModel, named after the plugin
While defining an AppController and AppModel for any normal application is not required, defining them for plugins is. You'll need to create them before your plugin works. These two special classes are named after the plugin, and extend the parent application's AppController and AppModel. Here's what they should look like:
Example 13.2. Pizza Plugin AppController: /app/plugins/pizza_app_controller.php
<?php
class PizzaAppController extends AppController
{
//...
}
?>
Example 13.3. Pizza Plugin AppModel: /app/plugins/pizza_app_model.php
<?php
class PizzaAppModel extends AppModel
{
//...
}
?>
If you forget to define these special classes, CakePHP will hand you "Missing Controller" errors until the problem is rectified.