Cover of the book Symfony 5: The Fast Track

Symfony 5: The Fast Track is the best book to learn modern Symfony development, from zero to production. +300 pages showcasing Symfony with Docker, APIs, queues & async tasks, Webpack, SPAs, etc.

  1. Home
  2. Documentation
  3. Reference
  4. Constraints
  5. NotBlank
WARNING: You are browsing the documentation for Symfony 3.1 which is not maintained anymore. Consider upgrading your projects to Symfony 5.2.

NotBlank

3.1 version
Maintained
4.4 5.1 5.2 current 5.3 dev
Unmaintained
2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 3.0 3.1 3.2 3.3 3.4 4.0 4.1 4.2 4.3 5.0

NotBlank

Validates that a value is not blank, defined as not strictly false, not equal to a blank string and also not equal to null. To force that a value is simply not equal to null, see the NotNull constraint.

Applies to property or method
Options
Class Symfony\Component\Validator\Constraints\NotBlank
Validator Symfony\Component\Validator\Constraints\NotBlankValidator

Basic Usage

If you wanted to ensure that the firstName property of an Author class were not blank, you could do the following:

  • Annotations
     1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
    // src/AppBundle/Entity/Author.php
namespace AppBundle\Entity;

use Symfony\Component\Validator\Constraints as Assert;

class Author
{
    /**
     * @Assert\NotBlank()
     */
    protected $firstName;
}
  • YAML
    1
2
3
4
5
    # src/AppBundle/Resources/config/validation.yml
AppBundle\Entity\Author:
    properties:
        firstName:
            - NotBlank: ~
  • XML
     1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
    <!-- src/AppBundle/Resources/config/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 http://symfony.com/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd">

    <class name="AppBundle\Entity\Author">
        <property name="firstName">
            <constraint name="NotBlank" />
        </property>
    </class>
</constraint-mapping>
  • PHP
     1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
    // src/AppBundle/Entity/Author.php
namespace AppBundle\Entity;

use Symfony\Component\Validator\Mapping\ClassMetadata;
use Symfony\Component\Validator\Constraints as Assert;

class Author
{
    public static function loadValidatorMetadata(ClassMetadata $metadata)
    {
        $metadata->addPropertyConstraint('firstName', new Assert\NotBlank());
    }
}

Options

message

type: string default: This value should not be blank.

This is the message that will be shown if the value is blank.

payload

type: mixed default: null

This option can be used to attach arbitrary domain-specific data to a constraint. The configured payload is not used by the Validator component, but its processing is completely up to you.

For example, you may want to use several error levels to present failed constraints differently in the front-end depending on the severity of the error.

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.