2 Deprecations in my Symfony 3 Project - symfony

Question

I have 2 deprecations in my Symfony 3 project when try to define a custom service in service.yml that I would like to solve but I don't get the way...
This my code FollowingExtension.php
<?php
namespace AppBundle\Twig;
use Symfony\Bridge\Doctrine\RegistryInterface;
class FollowingExtension extends \Twig_Extension {
protected $doctrine;
public function __construct(RegistryInterface $doctrine) {
$this->doctrine = $doctrine;
}
public function getFilters() {
return array(
new \Twig_SimpleFilter('following', array($this, 'followingFilter'))
);
}
public function followingFilter($user, $followed){
$following_repo = $this->doctrine->getRepository('BackendBundle:Following');
$user_following = $following_repo->findOneBy(array(
"user" => $user,
"followed" => $followed
));
if(!empty($user_following) && is_object($user_following)){
$result = true;
}else{
$result = false;
}
return $result;
}
public function getName() {
return 'following_extension';
}
}
And this is my services.yml:
following.twig_extension:
class: AppBundle\Twig\FollowingExtension
public: false
arguments:
$doctrine: "#doctrine"
tags:
- { name: twig.extension }
I would appreciate the help they gave me in trying to solve my problem.

Answer 1

First problem solution
It looks like because of registering services with duplicate name, as declared in your class:
`return 'following_extension';`
Make sure that you only have one twig service named following_extension. If you are sure that only one twig service named following_extension, you probably register more than one service using that class.
Second problem solution
Replace
`use Symfony\Bridge\Doctrine\RegistryInterface;`
with
`use Doctrine\Common\Persistence\ManagerInterface;`
and also replace
`public function __construct(RegistryInterface $doctrine) {`
with
`public function __construct(ManagerInterface $doctrine) {`

Answer 2

Finally solved the problem and i want share the info...
Reading the documentation of Symfony found this How to Create Service Aliases and Mark Services as Private and them I declared my service this way:
in service.yml:
following.twig_extension: '#AppBundle\Twig\FollowingExtension'
and FollowingExtension.php
<?php
namespace AppBundle\Twig;
use Doctrine\Common\Persistence\ManagerRegistry;
class FollowingExtension extends \Twig_Extension {
private $managerRegistry;
public function __construct(ManagerRegistry $managerRegistry) {
$this->managerRegistry = $managerRegistry;
}
public function getFilters() {
return array(
new \Twig_SimpleFilter('following', array($this, 'followingFilter'))
);
}
public function followingFilter($user, $followed){
$following_repo = $this->managerRegistry->getRepository('BackendBundle:Following');
$user_following = $following_repo->findOneBy(array(
"user" => $user,
"followed" => $followed
));
if(!empty($user_following) && is_object($user_following)){
$result = true;
}else{
$result = false;
}
return $result;
}
}
Thanks for helping me and I'm sorry if my english is bad.