Null

Validates that a value is exactly equal to null. To force that a property is simply blank (blank string or null), see the Blank constraint. To ensure that a property is not null, see NotNull.

Applies to	property or method
Options	message
Class	Symfony\Component\Validator\Constraints\Null
Validator	Symfony\Component\Validator\Constraints\NullValidator

Basic Usage

If, for some reason, you wanted to ensure that the firstName property of an Author class exactly equal to null, you could do the following:

• YAML

  # src/Acme/BlogBundle/Resources/config/validation.yml
  Acme\BlogBundle\Entity\Author:
      properties:
          firstName:
              - Null: ~
  

• Annotations

  // src/Acme/BlogBundle/Entity/Author.php
  namespace Acme\BlogBundle\Entity;
  
  use Symfony\Component\Validator\Constraints as Assert;
  
  class Author
  {
      /**
       * @Assert\Null()
       */
      protected $firstName;
  }
  

Options

message

type: string default: This value should be null

This is the message that will be shown if the value is not null.