Symfony2 Datetime format - symfony

Question

I'm trying to add a simple comment entity, with the "postedOn" attribute as a Datetime. Whenever I try to add a comment, I get this error :
Error: Call to undefined method Symfony\Component\Validator\Constraints\DateTime::format() in /var/www/vendor/doctrine/dbal/lib/Doctrine/DBAL/Types/DateTimeType.php line 53
Any idea ?
Here's the entity code :
<?php
namespace AOFVH\FlyBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* Comment
*
* #ORM\Table()
* #ORM\Entity(repositoryClass="AOFVH\FlyBundle\Entity\CommentRepository")
*/
class Comment
{
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #var integer
*
* #ORM\Column(name="rating", type="integer")
*/
private $rating;
/**
* #ORM\Column(type="datetime", nullable=true)
*/
protected $postedon;
/**
* #var string
*
* #ORM\Column(name="text", type="text")
*/
private $text;
/**
* #var $commenter
*
* #ORM\ManyToOne(targetEntity="AOFVH\UserBundle\Entity\User", inversedBy="comments", cascade={"persist", "merge"})
*/
private $commenter;
/**
* #var $commenter
*
* #ORM\ManyToOne(targetEntity="AOFVH\FlyBundle\Entity\Flight", inversedBy="comments", cascade={"persist", "merge"})
*/
private $flight;
/**
* Get id
*
* #return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set rating
*
* #param integer $rating
* #return Comment
*/
public function setRating($rating)
{
$this->rating = $rating;
return $this;
}
/**
* Get rating
*
* #return integer
*/
public function getRating()
{
return $this->rating;
}
/**
* Set text
*
* #param string $text
* #return Comment
*/
public function setText($text)
{
$this->text = $text;
return $this;
}
/**
* Get text
*
* #return string
*/
public function getText()
{
return $this->text;
}
/**
* Set commenter
*
* #param \AOFVH\UserBundle\Entity\User $commenter
* #return Comment
*/
public function setCommenter(\AOFVH\UserBundle\Entity\User $commenter = null)
{
$this->commenter = $commenter;
return $this;
}
/**
* Get commenter
*
* #return \AOFVH\UserBundle\Entity\User
*/
public function getCommenter()
{
return $this->commenter;
}
/**
* Set flight
*
* #param \AOFVH\FlyBundle\Entity\Flight $flight
* #return Comment
*/
public function setFlight(\AOFVH\FlyBundle\Entity\Flight $flight = null)
{
$this->flight = $flight;
return $this;
}
/**
* Get flight
*
* #return \AOFVH\FlyBundle\Entity\Flight
*/
public function getFlight()
{
return $this->flight;
}
Here are the postedOn getters and setters
/**
* Set postedon
*
* #param \DateTime $postedon
* #return Comment
*/
public function setPostedon($postedon)
{
$this->postedon = $postedon;
return $this;
}
/**
* Get postedon
*
* #return \DateTime
*/
public function getPostedon()
{
return $this->postedon;
}
}

Answer 1

I think it's your mapping in your entity, you don't use "datetime" doctrine format else your form type will try to generate a date with a string for example but for me "postedOn must always be defined on a new comment.You can update your entity constructor with : $this->setPostedOn(new \Datetime()); or you can use TimestampableTrait