With the introduction of Symfony 2 as the framework powering eZ Publish 5, the whole eZ Publish 4.x extensions system is changing. Pretty much everything needs to be done with entirely new concepts. In this chapter, we will see two ways of customizing eZ Publish 5: command line scripts (for import scripts, for instance), and custom controllers, the eZ Publish 5 equivalent of eZ Publish 4.x custom modules.
In order to test and use Public API code, you will need to build a custom bundle. Bundles are Symfony's extensions, and are therefore also used to extend eZ Publish. Symfony 2 provides code generation tools that will let you create your own bundle and get started in a few minutes.
In this chapter, we will show how to create a custom bundle, and implement both: a command line script and a custom route with its own controller action and view. All shell commands assume that you use some Linux shell, but those commands would of course also work on Windows systems.
Generating a new bundle
First, change the directory to your eZ Publish root.
Then use the app/console application with the
generate:bundle command to start the bundle generation wizard.
Let's follow the instructions provided by the wizard. Our objective is to create a bundle named
EzSystems/Bundles/CookBookBundle, located in the
The wizard will first ask about our bundle's namespace. Each bundle's namespace should feature a vendor name (in our own case:
EzSystems), optionally followed by a sub-namespace (we could have chosen to use
Bundle), and end with the actual bundle's name, suffixed with Bundle:
You will then be asked about the Bundle's name, used to reference your bundle in your code. We can go with the default,
EzSystemsCookbookBundle. Just hit enter to accept the default.
The next question is your bundle's location. By default, the script offers to place it in the
src folder. This is perfectly acceptable unless you have a good reason to place it somewhere else. Just hit enter to accept the default.
Next, you need to choose the generated configuration's format, out of YAML, XML, PHP or annotations. We mostly use yaml in eZ Publish 5, and we will use it in this cookbook. Enter 'yml', and hit enter.
The last choice is to generate code snippets demonstrating the Symfony directory structure. If you're learning Symfony, it is a good idea to accept, as it will pre-create a controller, yaml files, etc.
The generator will then summarize the previous choices, and ask for confirmation. Hit enter to confirm.
The wizard will generate the bundle, check autoloading, and ask about the activation of your bundle. Hit enter to both questions to have your bundle automatically added to your Kernel (
ezpublish/EzPublishKernel.php) and routes from your bundle added to the existing routes (
Your bundle should be generated and activated. Let's now see how you can interact with the Public API by creating a command line script, and a custom controller route and action.
Creating a command line script in your bundle
Writing a command line script with Symfony 2 is very easy. The framework and its bundles ship with a few scripts. They are all started using
php ezpublish/console <command> (
app/console in a default symfony 2 application). You can get the complete list of existing command line scripts by executing
php ezpublish/console list from the eZ Publish 5 root.
In this chapter, we will create a new command, identified as
ezpublish:cookbook:hello, that takes an optional name argument, and greets that name. To do so, we need one thing: a class with a name ending with "Command" that extends
Symfony\Component\Console\Command\Command. Note that in our case, we use
ContainerAwareCommand instead of
Command, since we need the dependency injection container to interact with the Public API). In your bundle's directory (
src/EzSystems/CookbookBundle), create a new directory named
Command, and in this directory, a new file named
Add this code to the file:
This is the skeleton for a command line script.
One class with a name ending with "Command" (
Symfony\Bundle\FrameworkBundle\Command\Command, and is part of our bundle's Command namespace. It has two methods:
execute(). We also import several classes & interfaces with the use keyword. The first two,
OutputInterface are used to 'typehint' the objects that will allow us to provide input & output management in our script.
Configure will be used to set your command's name, as well as its options and arguments. Execute will contain the actual implementation of your command. Let's start by creating the
First, we use setName() to set our command's name to "
ezpublish:cookbook:hello". We then use
setDefinition() to add an argument, named
name, to our command.
You can read more about arguments definitions and further options in the Symfony 2 Console documentation. Once this is done, if you run
php ezpublish/console list, you should see
ezpublish:cookbook:hello listed in the available commands. If you run it, it should just do nothing.
Let's just add something very simple to our execute() method so that our command actually does something.
You can now run the command from the eZ Publish 5 root.
Creating a custom route with a controller action
In this short chapter, we will see how to create a new route that will catch a custom URL and execute a controller action. We want to create a new route, /cookbook/test, that displays a simple 'Hello world' message. This tutorial is a simplified version of the official one that can be found on http://symfony.com/doc/current/book/controller.html.
eZ Publish 4 equivalent
This eZ Publish 5 extension would have been a custom module, with its own
module.php file, in eZ Publish 4.
During our bundle's generation, we have chosen to generate the bundle with default code snippets. Fortunately, almost everything we need is part of those default snippets. We just need to do some editing, in particular in two locations:
src/EzSystems/CookbookBundle/Controllers/DefaultController.php. The first one will be used to configure our route (
/cookbook/test) as well as the controller action the route should execute, while the latter will contain the actual action's code.
This is the file where we define our action's URL matching. The generated file contains this YAML block
We can safely remove this default code, and replace it with this
We define a route that matches the URI /cookbook/* and executes the action hello in the Default controller of our bundle. The next step is to create this method in the controller.
This controller was generated by the bundle generator. It contains one method,
helloAction(), that matched the YAML configuration we have changed in the previous part. Let's just rename the
indexAction() method so that we end up with this code
We won't go into details about controllers in this cookbook, but let's walk through the code a bit. This method receives the parameter defined in
routing.yml. It is named "name" in the route definition, and must be named $name in the matching action. Since the action is named "hello" in
routing.yml, the expected method name is
Controller actions must return a Response object that will contain the response's content, the headers, and various optional properties that affect the action's behavior. In our case, we simply set the content, using
setContent(), to "Hello $name". Simple. Go to http://ezpublish5/cookbook/hello/YourName, and you should get "Hello YourName".
With both command line scripts and HTTP routes, you have the basics you need to start writing Public API code.