How to Override any Part of a Bundle

How to Override any Part of a Bundle

This document is a quick reference for how to override different parts of third-party bundles.

Routing

Routing is never automatically imported in Symfony. If you want to include the routes from any bundle, then they must be manually imported from somewhere in your application (e.g. app/config/routing.yml).

The easiest way to "override" a bundle's routing is to never import it at all. Instead of importing a third-party bundle's routing, simply copy that routing file into your application, modify it, and import it instead.

Controllers

Assuming the third-party bundle involved uses non-service controllers (which is almost always the case), you can easily override controllers via bundle inheritance. For more information, see How to Use Bundle Inheritance to Override Parts of a Bundle. If the controller is a service, see the next section on how to override it.

Services & Configuration

If you want to modify service definitions of another bundle, you can use a compiler pass to change the class of the service or to modify method calls. In the following example, the implementing class for the original-service-id is changed to Acme\DemoBundle\YourService:

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// src/Acme/DemoBundle/DependencyInjection/Compiler/OverrideServiceCompilerPass.php
namespace Acme\DemoBundle\DependencyInjection\Compiler;

use Acme\DemoBundle\YourService;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;

class OverrideServiceCompilerPass implements CompilerPassInterface
{
    public function process(ContainerBuilder $container)
    {
        $definition = $container->getDefinition('original-service-id');
        $definition->setClass(YourService::class);
    }
}

For more information on compiler passes, see How to Work with Compiler Passes in Bundles.

Entities & Entity Mapping

Due to the way Doctrine works, it is not possible to override entity mapping of a bundle. However, if a bundle provides a mapped superclass (such as the User entity in the FOSUserBundle) one can override attributes and associations. Learn more about this feature and its limitations in the Doctrine documentation.

Forms

Existing form types can be modified defining form type extensions.

Validation Metadata

Symfony loads all validation configuration files from every bundle and combines them into one validation metadata tree. This means you are able to add new constraints to a property, but you cannot override them.

To overcome this, the 3rd party bundle needs to have configuration for validation groups. For instance, the FOSUserBundle has this configuration. To create your own validation, add the constraints to a new validation group:

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    # src/Acme/UserBundle/Resources/config/validation.yml
    FOS\UserBundle\Model\User:
        properties:
            plainPassword:
                - NotBlank:
                    groups: [AcmeValidation]
                - Length:
                    min: 6
                    minMessage: fos_user.password.short
                    groups: [AcmeValidation]
    
  • XML
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    <!-- src/Acme/UserBundle/Resources/config/validation.xml -->
    <?xml version="1.0" encoding="UTF-8" ?>
    <constraint-mapping xmlns="http://symfony.com/schema/dic/constraint-mapping"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://symfony.com/schema/dic/constraint-mapping
            http://symfony.com/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd">
    
        <class name="FOS\UserBundle\Model\User">
            <property name="plainPassword">
                <constraint name="NotBlank">
                    <option name="groups">
                        <value>AcmeValidation</value>
                    </option>
                </constraint>
    
                <constraint name="Length">
                    <option name="min">6</option>
                    <option name="minMessage">fos_user.password.short</option>
                    <option name="groups">
                        <value>AcmeValidation</value>
                    </option>
                </constraint>
            </property>
        </class>
    </constraint-mapping>
    

Now, update the FOSUserBundle configuration, so it uses your validation groups instead of the original ones.

Translations

Translations are not related to bundles, but to domains. That means that you can override the translations from any translation file, as long as it is in the correct domain.

Caution

Translation files are not aware of bundle inheritance. If you want to override translations from the parent bundle or another bundle, make sure that the bundle containing your translations is loaded after any bundle whose translations you're overriding. This is done in AppKernel.

Finally, translations located in app/Resources/translations will override all the other translations since those files are always loaded last.

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.