NotNull ======= Validates that a value is not strictly equal to ``null``. To ensure that a value is not blank (not a blank string), see the :doc:`/reference/constraints/NotBlank` constraint. ========== =================================================================== Applies to :ref:`property or method <validation-property-target>` Options - `groups`_ - `message`_ - `payload`_ Class :class:`Symfony\\Component\\Validator\\Constraints\\NotNull` Validator :class:`Symfony\\Component\\Validator\\Constraints\\NotNullValidator` ========== =================================================================== Basic Usage ----------- If you wanted to ensure that the ``firstName`` property of an ``Author`` class were not strictly equal to ``null``, you would: .. configuration-block:: .. code-block:: php-annotations // src/Entity/Author.php namespace App\Entity; use Symfony\Component\Validator\Constraints as Assert; class Author { /** * @Assert\NotNull */ protected $firstName; } .. code-block:: yaml # config/validator/validation.yaml App\Entity\Author: properties: firstName: - NotNull: ~ .. code-block:: xml <!-- config/validator/validation.xml --> <?xml version="1.0" encoding="UTF-8" ?> <constraint-mapping xmlns="http://symfony.com/schema/dic/constraint-mapping" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://symfony.com/schema/dic/constraint-mapping https://symfony.com/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd"> <class name="App\Entity\Author"> <property name="firstName"> <constraint name="NotNull"/> </property> </class> </constraint-mapping> .. code-block:: php // src/Entity/Author.php namespace App\Entity; use Symfony\Component\Validator\Constraints as Assert; use Symfony\Component\Validator\Mapping\ClassMetadata; class Author { public static function loadValidatorMetadata(ClassMetadata $metadata) { $metadata->addPropertyConstraint('firstName', new Assert\NotNull()); } } Options ------- .. include:: /reference/constraints/_groups-option.rst.inc ``message`` ~~~~~~~~~~~ **type**: ``string`` **default**: ``This value should not be null.`` This is the message that will be shown if the value is ``null``. You can use the following parameters in this message: =============== ============================================================== Parameter Description =============== ============================================================== ``{{ value }}`` The current (invalid) value =============== ============================================================== .. include:: /reference/constraints/_payload-option.rst.inc