OwnerVoter/Entity/Traits/OwnerTrait.php

<?php

namespace OwnerVoterBundle\Entity\Traits;

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

trait OwnerVoterTrait
{

    /**
     * @var string $owner
     *
     * @ORM\Column(type="string", length=128, nullable=false)
     *
     * @Assert\NotBlank(
     *      payload={"field"="owner"}
     * )
     */
    private $owner;

    /**
     * @return string
     */
    public function getOwner()
    {
        return $this->owner;
    }

    /**
     * @param string $owner
     *
     * @return $this
     */
    public function setOwner($owner = null)
    {
        $this->owner = $owner;
        return $this;
    }
}