Hi @stayeronglass, this error could be fix in the 4.4, with an annotation @Assert\DisableAutoMapping. But for the moment this is not possible. (https://github.com/symfony/symfony/pull/32107/files#diff-c8c4635301b6afd5d4c935ba49c24313R74)

The fact is, when the data are sent with the form, the validator try to validate the Entity, but with auto validation, because Timestampable Trait (if youy use it) required to be not null, but because you're not already in the pre persist doctrine event. The updatedAt and createdAt property are null.

You actually can authorize this properties to be null to avoid the auto validation on this properties. Then in 4.4, you can add the special Assertion. But, I'm not sure the Traits are not in this Bundle but in the Gedmo extension.

I try update project from SF 4.3 -> SF5.1.2 and have same problem (but only on update entity, create is well)...

Fields created_at and updated_at has no in form (in class PageType), but validation too... I tried use annotation @Assert\DisableAutoMapping in entity and on property, but this has no effect. If anyone could find a solution, please share it.

Do you have any constraints on these fields?

Looks like the problem is in DateTime constraint. In 5.0 you need to use Type("\DateTime") constraint
See https://github.com/symfony/symfony/blob/master/UPGRADE-5.0.md

Removed support for validating instances of \DateTimeInterface in DateTimeValidator, DateValidator and TimeValidator. Use Type instead or remove the constraint if the underlying model is type hinted to \DateTimeInterface already.

@BoShurik Thank you for the answer, and a tip where to look for the problem!!!

As I said earlier, PageType class does not have the createdAt and updatedAt fields at all. These fields are fully controlled via behavior Timestampable. But in trait, which these fields were added to entity, the validation rule was specified @Assert\DateTime().

/**
 * @ORM\Column(type="datetime", nullable=true)
 * @Gedmo\Mapping\Annotation\Timestampable(on="update")
 * @Assert\DateTime()
 * @var \DateTimeInterface
 */
private $updatedAt;

public function getUpdatedAt(): ?\DateTimeInterface
{
    return $this->updatedAt;
}

public function setUpdatedAt(?\DateTimeInterface $dateTime): self
{
    $this->updatedAt = $dateTime;
    return $this;
}

In my case, deleting the annotation @Assert\DateTime() helped fix the code. Using annotation @Assert\DisableAutoMapping has no effect at all.

I don't know it works right or not, and how disabling should work right... I think it's a little crooked:

• I set the validation rule for date / time (@Assert\DateTime()), but validator is waiting for a string (judging by the message in the debug panel, see screenshot).
• and @Assert\DisableAutoMapping doesn't disable auto validation.

As I said earlier, PageType class does not have the createdAt and updatedAt fields at all.

symfony/form does not validate data itself, it delegate this functionality to symfony/validator which don't know about PageType and just validate Page entity (model passed as data to a form)

As I said you need to replace @Assert\DateTime() to @Assert\Type("\DateTime"). It's a BC brake introduced in Symfony 5.0

As I said you need to replace @Assert\DateTime() to @Assert\Type("\DateTime"). It's a BC brake introduced in Symfony 5.0

Yes, everything works! That's great! Thanks!!!