How to access base in DependencyInjection?

Question

symfony

Please do not kick much, I'm still a teapot.
There was a task to load some user settings from the database. The admin writes these settings in the Sonata Admin section, and my task is to pull them out and use them in different places. And something seemed to me not very convenient to pull this data every time. I decided to try to load these settings into the service container in DependencyInjection.
Two questions arose:
1. Does such an approach have the right to life?
2. How to access the database from DependencyInjection?

Answer 1

Pass in the EntityManager constructor
Example:

class MyPropertyService{
  private $property1;
  // ....
  public function __construct(EntityManager $em){
    // ваш код  инициализации
    // $this->property1 = ...
  }
//...
}

<service id="my.property.service" class="Acme\SuperBundle\Services\MyPropertyService">
      <argument type="service" id="doctrine.orm.default_entity_manager"/>
</service>

Answer 2

Where will MyPropertyService be called from? From DependencyInjection call it?

Answer 3

Create a simple service:

use Doctirne\ORM\EntityManager;

class SettingLoader
{
  protected $em;
  public function __construct(EntityManager $em)
  {
    $this->em = $em;
  }

  public function get($key)
  {
    $val = $this->em->getRepository('MailBundle:Setting')->findOneBy(array('key' => $key));
    if (!$val) { throw new \InvalidArgumentException('Setting not found.'); }
    return $val;
  }
}

And finally, the service itself:

<service id="settings_loader" class="MyBundle\SettingLoader">
  <argument type="service" id="doctrine.orm.default_entity_manager" />
</service>

Key for default manager: doctrine.orm.default_entity_manager