Creating symfony command extending controller - php

Question

I am writing a symfony console command which will be executable by using "php bin/console app:mycommand" (symfony documentation: https://symfony.com/doc/current/console.html#creating-a-command).
In my MyCommand class I need to use the getDoctrine-function, so I have to extend the controller, but I don't see a way how to do that. Any ideas?
Currently I get following error on CLI: Attempted to call an undefined method named "getDoctrine" of class "App\Command\MyCommand".
<?php
// src/Command/MyCommand.php
namespace App\Command;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
class MyCommand extends Command
{
// the name of the command (the part after "bin/console")
protected static $defaultName = 'app:mycommand';
protected function configure()
{
}
protected function execute(InputInterface $input, OutputInterface $output)
{
// Not working, producing mentioned error
$em = $this->getDoctrine()->getManager();
}
}
?>

Answer 1

The getDoctrine() method is provided by the ControllerTrait, which in turn depends on the ContainerAwareTrait for the container injection. This however will pull additional services and methods that you won't need in a command so instead of injecting the whole container, the recommended approach is that you inject just the service you need, which in this case is the ObjectManager (ObjectManager is the common interface implemented both by the ORM and the ODM, if you use both or you just care about the ORM, you can use Doctrine\ORM\EntityManagerInterface instead).
<?php
// src/Command/MyCommand.php
namespace App\Command;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Doctrine\Common\Persistence\ObjectManager;
class MyCommand extends Command
{
// the name of the command (the part after "bin/console")
protected static $defaultName = 'app:mycommand';
private $manager;
public function __construct(ObjectManager $manager)
{
$this->manager = $manager;
parent::__construct();
}
protected function execute(InputInterface $input, OutputInterface $output)
{
// Now you have access to the manager methods in $this->manager
$repository = $this->manager->getRepository(/*...*/);
}
}