Error configuring multiples mongodb servers in Symfony 2.8 - mongodb

Question

I already have my app ( Symfony 2.8) hosted in Heroku. I have a mongoDB plugin to store session and it's working fine but when I try to add a replica server I face some problems. Replica is providaded by default for mongodb plugin. I mean
I am going to explain my environment and configuration:
ENV
I want to use this url ( it's which mongodb plugin provide me in Heroku)
MONGOLAB_URI = "mongodb://heroku_user:heroku_password#ds245975-a0.mlab.com:45975,ds245975-a1.mlab.com:45975/heroku_3b4l8zhl?replicaSet=rs-ds245975"
If I use this one is working:
MONGOLAB_URI = mongodb://heroku_user:heroku_password#ds245975-a0.mlab.com:45975/heroku_3b4l8zhl
CONF
In parameters.php I get this info:
$mongoLabUri = getenv('MONGOLAB_URI');
$mongoLabUri = getenv('MONGOLAB_URI');
if (false !== $mongoLabUri) {
$matches = [];
preg_match(
'#mongodb://(?P<user>.*?):(?P<password>.*?)#(?P<server>.*)/(?P<database>[^?]*)#',
$mongoLabUri,
$matches
);
$container->setParameter('mongo_server', 'mongodb://'.$matches['user'].':'.$matches['password'].'#'.$matches['server']."/".$matches['database']);
$container->setParameter('mongo_database', $matches['database']);
}
And in the configuration file, I configured the session handler to work with below parameters:
config.yml
doctrine_mongodb:
connections:
default:
server: %mongo_server%
options: {}
default_database: %mongo_database%
document_managers:
default:
auto_mapping: true
services:
session.handler.mongo:
class: Symfony\Component\HttpFoundation\Session\Storage\Handler\MongoDbSessionHandler
arguments: [#mongo, %mongo.session.options%]
mongo.connection:
class: MongoDoctrine\MongoDB\Connection
factory_service: doctrine.odm.mongodb.document_manager
factory_method: getConnection
calls:
- [initialize, []]
mongo:
class: Mongo
factory_service: mongo.connection
factory_method: getMongo
parameters:
mongo.session.options:
database: %mongo_database%
collection: session
Things that I tried
Configured the mongo_server with ?replicaSet=rs-ds245975
Remove ?replicaSet=rs-ds245975
I connect from mongo console to both server and it works.
Modified symfony configuration:
-https://symfony.com/doc/current/doctrine/mongodb_session_storage.html
-https://symfony.com/doc/master/bundles/DoctrineMongoDBBundle/config.html
Anything is working. I face different problem when I try to set the replica. It seems that there are some misunderstood that right now I am not able to see.
Any help/tip is welcome.

Answer 1

I need to modified the configuration of doctrine_mongodb in this way:
doctrine_mongodb:
connections:
default:
server: %mongo_server%
options:
connect: true
replicaSet: true
slaveOkay: true
default_database: %mongo_database%
document_managers:
default:
auto_mapping: true
And now is working