Doctrine2 PostgreSQL tsvector type class

TsvectorType.php

<?php
namespace Acme\AcmeBundle\Dbal;

use Doctrine\DBAL\Types\Type;
use Doctrine\DBAL\Platforms\AbstractPlatform;

class TsvectorType extends Type
{
	public function getName()
	{
		return 'tsvector';
	}

	public function canRequireSQLConversion()
	{
		return true;
	}

	public function getSqlDeclaration(array $fieldDeclaration, AbstractPlatform $platform)
	{
		return "TSVECTOR";
	}

	public function convertToPHPValue($value, AbstractPlatform $platform)
	{
		return $value;
	}

	public function convertToDatabaseValueSQL($sqlExpr, AbstractPlatform $platform)
	{
		return sprintf('to_tsvector(%s)', $sqlExpr);
	}

	public function convertToDatabaseValue($value, AbstractPlatform $platform)
	{
		if (is_array($value)) {
			$value = implode(" ", $value);
		}
		return $value;
	}
}

/** Config YML
doctrine:
    dbal:
        types:
            tsvector: Acme\AcmeBundle\Dbal\TsvectorType
        connections:
            default:
                mapping_types:
                  tsvector: tsvector
**/

// Entity column definition

/**
 * @var array|string $tsv
 * @ORM\Column(name="tsv", type="tsvector", nullable=true)
 */
private $tsv;