Symfony2 Timestable trait: "Column 'createdAt' cannot be null" - php

Question

I have a pretty standard Entity with the correct imports:
/**
* Budhaz\aMailerBundle\Entity\Instance
*
* #ORM\Table()
* #ORM\Entity
*/
class Instance {
use TimestampableEntity;
/** #ORM\Id #ORM\GeneratedValue #ORM\Column(type="integer") */
private $id;
...
}
But I would like to remove the createdAt (and updatedAt) from my form so the user don't and can't set them, so I remove it from the InstanceForm:
class InstanceType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('name')
->add('startAt')
->add('endAt')
//->add('createdAt')
//->add('updatedAt')
->add('campaign')
;
}
...
}
But now I have this error:
SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'createdAt' cannot be null
createdAt and updatedAt should automaticaly be set by Doctrine, but it stays null, anyone know why?

Answer 1

You have to set the values within the class manually. Then you can tell doctrine to set the new value before every update:
public function __construct() {
$this->setCreatedAt(new \DateTime());
$this->setUpdatedAt(new \DateTime());
}
/**
* #ORM\PreUpdate
*/
public function setUpdatedAtValue() {
$this->setUpdatedAt(new \DateTime());
}

Answer 2

app/config/config.yml
stof_doctrine_extensions:
orm:
default:
timestampable: true

Answer 3

You need to check if the bundle is installed. If not, run:
composer require stof/doctrine-extensions-bundle
It should create file: app/config/packages/stof_doctrine_extensions.yaml with the content:
stof_doctrine_extensions:
default_locale: en_US
orm:
default:
timestampable: true