--- date: 2020-11-12 id: ebceb7b8-5242-482b-b258-2cf9c25d1788 title: Unique Constraint --- # Syntax ``` php // src/Entity/Person.php namespace App\Entity; use Symfony\Component\Validator\Constraints as Assert; class Person { /** * @Assert\Unique(message="The {{ value }} email is repeated.") */ protected $contactEmails; } ```