If one wants to sort a collection of doctrine in the template after a time stamp (createdAt the example), before actually make this.

If this is not possible, e.g.. in the Sonata Admin Bundle, then you can use this twig extension:

{% foo| sortByCreatedAt('asc') %}

Twig extension code:

<?php

namespace App\Twig;

use App\Entity\Tag;
use Doctrine\ORM\PersistentCollection;
use Twig\Extension\AbstractExtension;
use Twig\TwigFilter;

class AppExtension extends AbstractExtension
{
    public function getFilters()
    {
        return array(
            new TwigFilter('sortByCreatedAt', array($this, 'sortByCreatedAt')),
        );
    }

    /**
     * @param PersistentCollection $objects
     * @return mixed
     */
    public function sortByCreatedAt($objects, $direction = 'asc')
    {
        $objects = $objects->toArray();
        usort($objects, function ($a, $b) use($direction) {
            if ($direction === 'asc') {
                return $a->getCreatedAt() >  $b->getCreatedAt();
            } elseif ($direction === 'desc') {
                return $a->getCreatedAt() <  $b->getCreatedAt();
            } else {
                throw new \Exception('unknown sort direction');
            }

        });
        return $objects;
    }
}

The PasswordEncoder the symfony framework secure hashes of passwords in the database is very well suitable also in future to save and configure Central.

The SecurityBundle must if necessary. to be installed:

composer require symfony/security-bundle

Putting this in the security.yaml, you want to use what hashing algorithm for which entity:

security:
    encoders:
        App\Entity\User: bcrypt

The entity must implement the UserInterface: more…

In symfony 3 is by default the EntityManager injected, then get the corresponding repository available.

Most of the time, but just a repository is required and to bloat the code and tests.

There is a simple way in the configuration to create a service from a repository:

service.repository.name:
 class: 'AppBundle\Repository\MyEntity'
 factory: 'Doctrine\ORM\EntityManagerInterface:getRepository'
 arguments: ['AppBundle\Entity\MyEntity']