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How to Provide Model Classes for several Doctrine Implementations

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How to Provide Model Classes for several Doctrine Implementations

When building a bundle that could be used not only with Doctrine ORM but also the CouchDB ODM, MongoDB ODM or PHPCR ODM, you should still only write one model class. The Doctrine bundles provide a compiler pass to register the mappings for your model classes.

Note

For non-reusable bundles, the easiest option is to put your model classes in the default locations: Entity for the Doctrine ORM or Document for one of the ODMs. For reusable bundles, rather than duplicate model classes just to get the auto mapping, use the compiler pass.

New in version 2.3: The base mapping compiler pass was introduced in Symfony 2.3. The Doctrine bundles support it from DoctrineBundle >= 1.3.0, MongoDBBundle >= 3.0.0, PHPCRBundle >= 1.0.0-alpha2 and the (unversioned) CouchDBBundle supports the compiler pass since the CouchDB Mapping Compiler Pass pull request was merged.

If you want your bundle to support older versions of Symfony and Doctrine, you can provide a copy of the compiler pass in your bundle. See for example the FOSUserBundle mapping configuration addRegisterMappingsPass.

In your bundle class, write the following code to register the compiler pass. This one is written for the FOSUserBundle, so parts of it will need to be adapted for your case:

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use Doctrine\Bundle\DoctrineBundle\DependencyInjection\Compiler\DoctrineOrmMappingsPass;
use Doctrine\Bundle\MongoDBBundle\DependencyInjection\Compiler\DoctrineMongoDBMappingsPass;
use Doctrine\Bundle\CouchDBBundle\DependencyInjection\Compiler\DoctrineCouchDBMappingsPass;
use Doctrine\Bundle\PHPCRBundle\DependencyInjection\Compiler\DoctrinePhpcrMappingsPass;

class FOSUserBundle extends Bundle
{
    public function build(ContainerBuilder $container)
    {
        parent::build($container);
        // ...

        $modelDir = realpath(__DIR__.'/Resources/config/doctrine/model');
        $mappings = array(
            $modelDir => 'FOS\UserBundle\Model',
        );

        $ormCompilerClass = 'Doctrine\Bundle\DoctrineBundle\DependencyInjection\Compiler\DoctrineOrmMappingsPass';
        if (class_exists($ormCompilerClass)) {
            $container->addCompilerPass(
                DoctrineOrmMappingsPass::createXmlMappingDriver(
                    $mappings,
                    array('fos_user.model_manager_name'),
                    'fos_user.backend_type_orm'
            ));
        }

        $mongoCompilerClass = 'Doctrine\Bundle\MongoDBBundle\DependencyInjection\Compiler\DoctrineMongoDBMappingsPass';
        if (class_exists($mongoCompilerClass)) {
            $container->addCompilerPass(
                DoctrineMongoDBMappingsPass::createXmlMappingDriver(
                    $mappings,
                    array('fos_user.model_manager_name'),
                    'fos_user.backend_type_mongodb'
            ));
        }

        $couchCompilerClass = 'Doctrine\Bundle\CouchDBBundle\DependencyInjection\Compiler\DoctrineCouchDBMappingsPass';
        if (class_exists($couchCompilerClass)) {
            $container->addCompilerPass(
                DoctrineCouchDBMappingsPass::createXmlMappingDriver(
                    $mappings,
                    array('fos_user.model_manager_name'),
                    'fos_user.backend_type_couchdb'
            ));
        }

        $phpcrCompilerClass = 'Doctrine\Bundle\PHPCRBundle\DependencyInjection\Compiler\DoctrinePhpcrMappingsPass';
        if (class_exists($phpcrCompilerClass)) {
            $container->addCompilerPass(
                DoctrinePhpcrMappingsPass::createXmlMappingDriver(
                    $mappings,
                    array('fos_user.model_manager_name'),
                    'fos_user.backend_type_phpcr'
            ));
        }
    }
}

Note the class_exists check. This is crucial, as you do not want your bundle to have a hard dependency on all Doctrine bundles but let the user decide which to use.

The compiler pass provides factory methods for all drivers provided by Doctrine: Annotations, XML, Yaml, PHP and StaticPHP. The arguments are:

  • a map/hash of absolute directory path to namespace;
  • an array of container parameters that your bundle uses to specify the name of the Doctrine manager that it is using. In the above example, the FOSUserBundle stores the manager name that's being used under the fos_user.model_manager_name parameter. The compiler pass will append the parameter Doctrine is using to specify the name of the default manager. The first parameter found is used and the mappings are registered with that manager;
  • an optional container parameter name that will be used by the compiler pass to determine if this Doctrine type is used at all. This is relevant if your user has more than one type of Doctrine bundle installed, but your bundle is only used with one type of Doctrine.

Note

The factory method is using the SymfonyFileLocator of Doctrine, meaning it will only see XML and YML mapping files if they do not contain the full namespace as the filename. This is by design: the SymfonyFileLocator simplifies things by assuming the files are just the "short" version of the class as their filename (e.g. BlogPost.orm.xml)

If you also need to map a base class, you can register a compiler pass with the DefaultFileLocator like this. This code is simply taken from the DoctrineOrmMappingsPass and adapted to use the DefaultFileLocator instead of the SymfonyFileLocator:

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private function buildMappingCompilerPass()
{
    $arguments = array(array(realpath(__DIR__ . '/Resources/config/doctrine-base')), '.orm.xml');
    $locator = new Definition('Doctrine\Common\Persistence\Mapping\Driver\DefaultFileLocator', $arguments);
    $driver = new Definition('Doctrine\ORM\Mapping\Driver\XmlDriver', array($locator));

    return new DoctrineOrmMappingsPass(
        $driver,
        array('Full\Namespace'),
        array('your_bundle.manager_name'),
        'your_bundle.orm_enabled'
    );
}

Now place your mapping file into /Resources/config/doctrine-base with the fully qualified class name, separated by . instead of \, for example Other.Namespace.Model.Name.orm.xml. You may not mix the two as otherwise the SymfonyFileLocator will get confused.

Adjust accordingly for the other Doctrine implementations.

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