[FrameworkBundle] define doctrine as default_pdo_provider only if the package is installed

Author: nicolas-grekas

DependencyInjection/Configuration.php

@@ -13,6 +13,7 @@
 
 use Doctrine\Common\Annotations\Annotation;
 use Doctrine\Common\Cache\Cache;
+use Doctrine\DBAL\Connection;
 use Symfony\Bundle\FullStack;
 use Symfony\Component\Asset\Package;
 use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;
@@ -882,7 +883,7 @@ private function addCacheSection(ArrayNodeDefinition $rootNode)
                         ->scalarNode('default_psr6_provider')->end()
                         ->scalarNode('default_redis_provider')->defaultValue('redis://localhost')->end()
                         ->scalarNode('default_memcached_provider')->defaultValue('memcached://localhost')->end()
-                        ->scalarNode('default_pdo_provider')->defaultValue('doctrine.dbal.default_connection')->end()
+                        ->scalarNode('default_pdo_provider')->defaultValue(class_exists(Connection::class) ? 'database_connection' : null)->end()
                         ->arrayNode('pools')
                             ->useAttributeAsKey('name')
                             ->prototype('array')

Tests/DependencyInjection/ConfigurationTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection;
 
+use Doctrine\DBAL\Connection;
 use PHPUnit\Framework\TestCase;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Configuration;
 use Symfony\Bundle\FullStack;
@@ -268,7 +269,7 @@ protected static function getBundleDefaultConfig()
                 'directory' => '%kernel.cache_dir%/pools',
                 'default_redis_provider' => 'redis://localhost',
                 'default_memcached_provider' => 'memcached://localhost',
-                'default_pdo_provider' => 'doctrine.dbal.default_connection',
+                'default_pdo_provider' => class_exists(Connection::class) ? 'database_connection' : null,
             ),
             'workflows' => array(
                 'enabled' => false,