Symfony2 Doctrine Metadata Cache with Redis Issue - php

Question

I'm trying to use Redis as a driver for caching doctrine metadata, query and results. Follwing is my configuration.
auto_generate_proxy_classes: "%kernel.debug%"
naming_strategy: doctrine.orm.naming_strategy.underscore
auto_mapping: true
result_cache_driver:
type: redis
host: %redis_host%
instance_class: Redis
query_cache_driver: redis
#metadata_cache_driver: redis
When I remove the comment from line #metadata_cache_driver: redis, I get an error running a test I have with following error.
TypeError: Argument 1 passed to Doctrine\ORM\Mapping\ClassMetadataFactory::wakeupReflection() must implement interface Doctrine\Common\Persistence\Mapping\ClassMetadata, string given, called in vendor/doctrine/common/lib/Doctrine/Common/Persistence/Mapping/AbstractClassMetadataFactory.php on line 214
My Functional Test looks like Following:
public function testX()
{
//The data in prepared in setup..
$param1 = 'test-id';
$param2 = 'test-key';
$result = $this->em->getRepository('MyBundle:Test')
->findOneByXX($param1, $param2);
$this->assertTrue($result instanceof Test);
}
And My Query looks like following:
$qb->select('c')
->from('MyBundle:Test', 'c')
->where('c.id = :id')
->andWhere('c.key = :key')
->setParameter('id', $id)
->setParameter('key', $key);
$query = $qb->getQuery()
->useResultCache(true);
return $query->getOneOrNullResult();
Do I need additional configuration for Redis? Any Help would be appreciated??

Answer 1

I believe to resolve this you need to set the serializer for redis, the default serializer is probably not aware of the the PHP classes and when the object is removed from cache, and unserialized, it is not the same type as it was prior to serialization.
$redis->setOption(\Redis::OPT_SERIALIZER, \Redis::SERIALIZER_PHP);
For you case you will probably need to set the configuration option as a part of the driver configuration.