How to define Controllers as Services¶

In the book, you've learned how easily a controller can be used when it extends the base Controller class. While this works fine, controllers can also be specified as services.

To refer to a controller that's defined as a service, use the single colon (:) notation. For example, suppose we've defined a service called my_controller and we want to forward to a method called indexAction() inside the service:

$this->forward('my_controller:indexAction', array('foo' => $bar));

You need to use the same notation when defining the route _controller value:

my_controller:
    pattern:   /
    defaults:  { _controller: my_controller:indexAction }

To use a controller in this way, it must be defined in the service container configuration. For more information, see the Service Container chapter.

When using a controller defined as a service, it will most likely not extend the base Controller class. Instead of relying on its shortcut methods, you'll interact directly with the services that you need. Fortunately, this is usually pretty easy and the base Controller class itself is a great source on how to perform many common tasks.