Как проверить существует ли Many-To-Many связь у расширяемой сущности

Пример кода, который проверяет, существует ли Many-To-Many связь и если она не существует - создает ее:

<?php

namespace Acme\Bundle\FavoriteBundle\Migrations\Schema\v1_0;

use Doctrine\DBAL\Schema\Schema;
use Oro\Bundle\EntityExtendBundle\EntityConfig\ExtendScope;
use Oro\Bundle\EntityExtendBundle\Migration\Extension\ExtendExtension;
use Oro\Bundle\EntityExtendBundle\Migration\Extension\ExtendExtensionAwareInterface;
use Oro\Bundle\EntityExtendBundle\Tools\ExtendDbIdentifierNameGenerator;
use Oro\Bundle\MigrationBundle\Migration\Extension\NameGeneratorAwareInterface;
use Oro\Bundle\MigrationBundle\Migration\QueryBag;
use Oro\Bundle\MigrationBundle\Migration\Migration;
use Oro\Bundle\MigrationBundle\Tools\DbIdentifierNameGenerator;

/**
 * Class CreateCustomerUserProductFavoriteRelation.
 *
 * @package Acme\Bundle\FavoriteBundle\Migrations\Schema\v1_0
 */
class CreateCustomerUserProductFavoriteRelation implements
    Migration,
    ExtendExtensionAwareInterface,
    NameGeneratorAwareInterface
{

    /**
     * @var ExtendExtension
     */
    protected $extendExtension;

    /**
     * @var ExtendDbIdentifierNameGenerator
     */
    protected $nameGenerator;

    /**
     * {@inheritdoc}
     */
    public function setExtendExtension(ExtendExtension $extendExtension): void
    {
        $this->extendExtension = $extendExtension;
    }

    /**
     * {@inheritdoc}
     */
    public function setNameGenerator(DbIdentifierNameGenerator $nameGenerator): void
    {
        $this->nameGenerator = $nameGenerator;
    }

    /**
     * {@inheritdoc}
     */
    public function up(Schema $schema, QueryBag $queries): void
    {
        $associationName = 'favoriteProducts';
        $table = 'oro_customer_user';
        $targetTable = 'oro_product';

        $joinTableName = $this->nameGenerator->generateManyToManyJoinTableName(
            $this->extendExtension->getEntityClassByTableName($table),
            $associationName,
            $this->extendExtension->getEntityClassByTableName($targetTable)
        );

        if ($schema->hasTable($joinTableName)) {
            return;
        }

        $this->extendExtension->addManyToManyRelation(
            $schema,
            $table,
            $associationName,
            $targetTable,
            ['id'],
            ['id'],
            ['id'],
            [
                'extend' => [
                    'is_extend' => true,
                    'owner' => ExtendScope::OWNER_CUSTOM,
                    'without_default' => true,
                    'on_delete' => 'CASCADE',
                ],
                'form' => ['is_enabled' => false],
                'view' => ['is_displayable' => false],
                'dataaudit' => ['auditable' => false]
            ]
        );
    }
}
Oro Symfony Doctrine
Benya