How to Use Bundle Inheritance to Override Parts of a Bundle
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When working with third-party bundles, you'll probably come across a situation
where you want to override a file in that third-party bundle with a file
in one of your own bundles. Symfony gives you a very convenient way to override
things like controllers, templates, and other files in a bundle's
Resources/ directory.
For example, suppose that you have installed FOSUserBundle, but you want to
override its base layout.html.twig template, as well as one of its
controllers.
First, create a new bundle called UserBundle and enable it in your application. Then, register the third-party FOSUserBundle as the "parent" of your bundle:
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// src/UserBundle/UserBundle.php
namespace UserBundle;
use Symfony\Component\HttpKernel\Bundle\Bundle;
class UserBundle extends Bundle
{
public function getParent()
{
return 'FOSUserBundle';
}
}By making this simple change, you can now override several parts of the FOSUserBundle simply by creating a file with the same name.
Note
Despite the method name, there is no parent/child relationship between the bundles, it is just a way to extend and override an existing bundle.
Overriding Controllers
Suppose you want to add some functionality to the registerAction() of a
RegistrationController that lives inside FOSUserBundle. To do so,
just create your own RegistrationController.php file, override the bundle's
original method, and change its functionality:
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// src/UserBundle/Controller/RegistrationController.php
namespace UserBundle\Controller;
use FOS\UserBundle\Controller\RegistrationController as BaseController;
class RegistrationController extends BaseController
{
public function registerAction()
{
$response = parent::registerAction();
// ... do custom stuff
return $response;
}
}Tip
Depending on how severely you need to change the behavior, you might
call parent::registerAction() or completely replace its logic with
your own.
Note
Overriding controllers in this way only works if the bundle refers to
the controller using the standard FOSUserBundle:Registration:register
syntax in routes and templates. This is the best practice.
Overriding Resources: Templates, Routing, etc
Most resources can also be overridden, simply by creating a file in the same location as your parent bundle.
For example, it's very common to need to override the FOSUserBundle's
layout.html.twig template so that it uses your application's base layout.
Since the file lives at Resources/views/layout.html.twig in the FOSUserBundle,
you can create your own file in the same location of UserBundle. Symfony will
ignore the file that lives inside the FOSUserBundle entirely, and use your file
instead.
The same goes for routing files and some other resources.
Note
The overriding of resources only works when you refer to resources with
the @FOSUserBundle/Resources/config/routing/security.xml method.
You need to use the @BundleName shortcut when referring to resources
so they can be successfully overridden (except templates, which are
overridden in a different way, as explained in How to Override Templates from Third-Party Bundles).
Caution
Translation and validation files do not work in the same way as described above. Read "How to Override any Part of a Bundle" if you want to learn how to override translations and see "How to Override any Part of a Bundle" for tricks to override the validation.