Dvd.php

/**
 * Dvd
 *
 * @ORM\Table(name="dvd")
 * @ORM\Entity
 */
class Dvd
{
    /**
     * @var integer
     *
     * @ORM\Column(name="id", type="integer", nullable=false)
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="IDENTITY")
     * @ORM\OneToOne(targetEntity="DvdDescription", mappedBy="dvd")
     */
    private $id;

    /**
     *
     * @Assert\Valid
     * @Assert\NotBlank()
     * @ORM\OneToOne(targetEntity="DvdDescription", mappedBy="dvd", cascade={"persist", "remove"})
     */
    private $dvdDescription;

    /**
     * @return \Doctrine\Common\Collections\ArrayCollection|DvdDescription
     */
    public function getDvdDescription()
    {
        return $this->dvdDescription;
    }

    /**
     * Set Dvd Info
     *
     * @param DvdDescription $dvdDescription
     * @return $this
     */
    public function setDvdDescription(DvdDescription $dvdDescription)
    {
        $dvdDescription->setDvd($this);
        $this->dvdDescription = $dvdDescription;

        return $this;
    }

DvdDescription.php

/**
 * DvdDescription
 *
 * @ORM\Table(name="dvd_description")
 * @ORM\Entity
 */
class DvdDescription
{
    /**
     * @var string
     *
     * @ORM\Column(name="title", type="string", length=200, nullable=false)
     */
    private $title;

    /**
     * @var string
     *
     * @ORM\Column(name="description", type="text", nullable=false)
     */
    private $description;

    /**
     * @var \Dvd
     *
     * @ORM\Id
     * @ORM\OneToOne(targetEntity="Dvd", inversedBy="id")
     * @ORM\JoinColumns({
     *   @ORM\JoinColumn(name="dvd_id", referencedColumnName="id")
     * })
     */
    private $dvd;

    /**
     * Set title
     *
     * @param string $title
     * @return DvdDescription
     */
    public function setTitle($title)
    {
        $this->title = $title;

        return $this;
    }

    /**
     * Get title
     *
     * @return string
     */
    public function getTitle()
    {
        return $this->title;
    }

    /**
     * Set description
     *
     * @param string $description
     * @return DvdDescription
     */
    public function setDescription($description)
    {
        $this->description = $description;

        return $this;
    }

    /**
     * Get description
     *
     * @return string
     */
    public function getDescription()
    {
        return $this->description;
    }

    /**
     * Set dvd
     *
     * @param $dvd
     * @return DvdDescription
     */
    public function setDvd(Dvd $dvd)
    {
        $this->dvd = $dvd;

        return $this;
    }

    /**
     * Get dvd
     *
     * @return Dvd
     */
    public function getDvd()
    {
        return $this->dvd;
    }
}