Working with choice attributes.

ChoiceExtension.php

<?php

namespace Acme\DemoBundle\Twig;

use Symfony\Component\PropertyAccess\PropertyAccess;
use Doctrine\Common\Inflector\Inflector;

class ChoiceExtension extends \Twig_Extension
{
    /**
     * Property Accessor
     *
     * @var Symfony\Component\PropertyAccess\PropertyAccess\PropertyAccessorInterface
     */
    private $accessor;

    /**
     * Doctrine inflector
     *
     * @var Doctrine\Common\Inflector\Inflector
     */
    private $inflector;

    /**
     * Constructor
     */
    public function __construct()
    {
        $this->accessor  = PropertyAccess::getPropertyAccessor();
        $this->inflector = new Inflector();
    }

    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return 'acme_demo_choice_extension';
    }

    /**
     * {@inheritdoc}
     */
    public function getFunctions()
    {
        return array(
            new \Twig_SimpleFunction('chosen', array($this, 'getChosenValue')),
        );
    }

    /**
     * Get the chosen value of a choice attribute
     *
     * @param mixed $entity The entity to get chosen value for
     * @param string $property The property
     * @param string $choicesProperty The property that hold the translation keys
     *
     * @return string
     */
    public function getChosenValue($entity, $property, $choicesProperty = null)
    {
        if ($choicesProperty === null) {
            $choicesProperty = $this->inflector->pluralize($property);
        }

        $value   = $this->accessor->getValue($entity, $property);
        $choices = $this->accessor->getValue($entity, $choicesProperty);

        return isset($choices[$value]) ? $choices[$value] : null;
    }
}

ProfileType.php

<?php

namespace Acme\DemoBundle\Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
use Acme\DemoBundle\Entity\User;

class ProfileType extends AbstractType
{
    /**
     *  {@inheritdoc}
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('status', 'choice', array('choices' => User::getStatus()));
    }

    /**
     *  {@inheritdoc}
     */
    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array('data_class' => 'Acme\DemoBundle\Entity\User'));
    }

    /**
     *  {@inheritdoc}
     */
    public function getName()
    {
        return 'profile';
    }
}

User.php

<?php

namespace Acme\DemoBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;

/**
 * User
 *
 * @ORM\Table()
 * @ORM\Entity()
 */
class User
{
    const STATUS_SINGLE       = 0;
    const STATUS_RELATIONSHIP = 1;
    const STATUS_ENGAGED      = 2;

    /**
     * @var integer
     *
     * @ORM\Column(name="status", type="smallint")
     * @Assert\Choice(callback="getAvailableStatus")
     */
    protected $status;

    /**
     * Get available values and translate keys for status
     *
     * @return array
     */
    public static function getStatus()
    {
        return array(
            self::STATUS_SINGLE       => 'user.status.single',
            self::STATUS_RELATIONSHIP => 'user.status.relationship',
            self::STATUS_ENGAGED      => 'user.status.engaged',
        );
    }

    /**
     * Get available values for status
     *
     * @return array
     */
    public static function getAvailableStatus()
    {
        return array_keys(self::getStatus());
    }
}

user_profile.html.twig

{{ chosen(user, 'status')|trans }}