Category: Work

If you’re using the validation/validator component (eg. https://symfony.com/doc/current/components/validator.html) outside of the symfony framework and need to access a service within a custom constraint, here’s how to do it;

Create a ContainerConstraintValidatorFactory;

If you’re using the validation/validator component outside of the Symfony framework and need to access a service within a custom constraint (eg. http://symfony.com/doc/current/validation/custom_constraint.html), here’s how to do it;

Create a ContainerConstraintValidatorFactory;

use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidatorFactory;
use Symfony\Component\Validator\ConstraintValidatorFactoryInterface;

class ContainerConstraintValidatorFactory extends ConstraintValidatorFactory implements ConstraintValidatorFactoryInterface {
 private $container;
 
 public function __construct(ContainerInterface $container) {
  parent::__construct();
  $this->container = $container;
 }
 
 public function getInstance(Constraint $constraint) {
  if($this->container->has($constraint->validatedBy())) {
   return $this->container->get($constraint->validatedBy());
  }
 
  return parent::getInstance($constraint);
 }
}

From there, when you’re creating your ‘validator’, you’ll need to use your newly created factory;

$validatorBuilder = Validation::createValidatorBuilder();
$validatorBuilder->setConstraintValidatorFactory(
   new ContainerConstraintValidatorFactory($container)
);
$validator = $validatorBuilder->getValidator();

This will use your container to check if the constraint-validator class is registered … if so, it’ll be used, otherwise it’ll behave as normal.

Reference: https://stackoverflow.com/questions/40601866/how-to-configure-dependencies-on-custom-validator-with-symfony-components

UPDATE: Symfony: Adding messages to the translator dynamically (updated) contains an update to the post below

To add to the translator (eg. from the DB / by user / etc), you need to first create your own translator class or force Symfony to use the base one (otherwise it’ll compile things together and use a read-only one when it comes to accessing your site).

First, in your services.yml file;

translator:
    public: true
    alias: 'Symfony\Bundle\FrameworkBundle\Translation\Translator'

Symfony\Bundle\FrameworkBundle\Translation\Translator:
  class: Symfony\Bundle\FrameworkBundle\Translation\Translator
  arguments:
      - '@service_container'
      - '@translator.selector'
      - '%kernel.default_locale%'

This just tells Symfony to use the base translator, or alternatively you can use your own as follows;

app/config/services.yml

translator:
  public: true
  alias: 'YourNamespace\YourTranslatorClassName'

From there you can add a listener or just need to obtain an instance of the Translator on-load, and add in any resources as required – eg;

your-listener / controller / etc;

use Symfony\Component\Translation\Loader\ArrayLoader

...

$translator->addLoader('array', new ArrayLoader());
$translator->addResource('array', ["my.word" => "Hello"], $translator->getLocale());

$translator is an instance of “Symfony\Component\Translation\Translator”.

More info;
https://symfony.com/doc/current/components/translation/usage.html

Generating absolute urls (including hostname and scheme (http / https) is super useful for including full urls in templates or email content (eg. when you want to pass on an address to someone which is getting your emails!)

How?

In templates;

{{ absolute_url(path('route_name', {...})) }}

In controllers;

use Symfony\Component\Routing\Generator\UrlGeneratorInterface;


$url = $this->generate(
'app_default_index',
['name' => 'Steve'], UrlGeneratorInterface::ABSOLUTE_URL
);

In services;

First import the class name for the url generator, and instance of the generator;

use Symfony\Component\Routing\Generator\UrlGeneratorInterface;

/** @var UrlGeneratorInterface */
protected $urlGenerator;

/**
 * Inject URL Generator as a service
 * @param UrlGeneratorInterface $urlGenerator
 * @required
 */
public function setUrlGeneratorService(UrlGeneratorInterface $urlGenerator) {
    $this->urlGenerator = $urlGenerator;
}

Then, inside your method (in the service);

$url = $this->urlGenerator->generate(
'app_default_index',
['name' => 'Steve'], UrlGeneratorInterface::ABSOLUTE_URL
);