DoctrineMongoDBBundle | Symfony2 Bundle to enable mongo document manager | Web Framework library

I'm trying to create a new Symfony4 project with MongoDB.

First I created a Symfony4 project using this documentation: https://symfony.com/doc/current/setup.html

Then I included MongoDB using this documentation: http://symfony.com/doc/current/bundles/DoctrineMongoDBBundle/index.html

I tried to follow the instructions as exactly as possible (for example I didn't need to add anything to app/AppKernel.php, but MongoDB was automatically added to config/bundles.php).

Now I think everything should work, but my Symfony app doesn't find the MongoDB Service:

I'm currently using Symfony 4 with Doctrine MongoDB Bundle, following the instruction from this link: DoctrineMongoDBBundle. So, I have a UserDocument:

src/Document/UserDocument.php

I'm trying to test the all method of a repository, but I do not know how to do the test, I want to use Profecy. I'm using DoctrineMongoDBBundle.

Entity

Simple question :

I am using mongoDB, Symfony 3.4, and the DoctrineMongoDBBundle. How can I create a value in an mongoDB entity that is an array of entities

For example : Have a conversation entity with a value message in it that is an array of entities message

Example in json :

I've followed official tutorial on how to integrate MongoDB with Doctrine 2 in Symfony 2.8. DoctrineMongoDBBundle, and everything went fine until this point:

In my controller I'm trying to push some data in my MongoDB

I want to insert data into MongoDB with Symfony 2 using DoctrineMongoDBBundle. I have followed this tutorial from Symfony Documentation. In my controller class i have this function

...

I have two MongoDB instances - one slave and one master. There is an Arbiter too.

Basically the setup is the following: (Image Source: https://docs.mongodb.com/manual/replication/)

In my Symfony application, in config.yml I have this for MongoDB: