September 15, 2017 Javier Eguiluz

The Valid constraint enables validation on objects that are embedded as properties on the object being validated. This allows you to validate an object and all sub-objects associated with it. For example, validate the Address object embedded in an Author object:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 // src/AppBundle/Entity/Address.php namespace AppBundle\Entity ; use Symfony\Component\Validator\Constraints as Assert ; class Address { /** @Assert\NotBlank() */ protected $street ; /** @Assert\Length(max = 5) */ protected $zipCode ; } // src/AppBundle/Entity/Author.php namespace AppBundle\Entity ; use Symfony\Component\Validator\Constraints as Assert ; class Author { /** @Assert\NotBlank */ protected $firstName ; /** @Assert\NotBlank */ protected $lastName ; /** @Assert\Valid */ protected $address ; }

The main shortcoming of this constraint it that it doesn't support validation groups. In Symfony 3.4, we improved the Valid constraint to add support for groups:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 // src/AppBundle/Entity/Address.php // ... class Address { /** @Assert\NotBlank(groups={"basic"}) */ protected $street ; /** @Assert\Length(max = 5) */ protected $zipCode ; } // src/AppBundle/Entity/Author.php // ... class Author { /** @Assert\NotBlank */ protected $firstName ; /** @Assert\NotBlank */ protected $lastName ; /** @Assert\Valid(groups={"basic"}) */ protected $address ; }