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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.

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  5. NotBlank
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NotBlank

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NotBlank

Validates that a value is not blank, defined as 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:

  • YAML
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    # src/BlogBundle/Resources/config/validation.yml
Acme\BlogBundle\Entity\Author:
    properties:
        firstName:
            - NotBlank: ~
  • Annotations
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    // src/Acme/BlogBundle/Entity/Author.php
namespace Acme\BlogBundle\Entity;

use Symfony\Component\Validator\Constraints as Assert;

class Author
{
    /**
     * @Assert\NotBlank()
     */
    protected $firstName;
}
  • XML
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    <!-- src/Acme/BlogBundle/Resources/config/validation.xml -->
<class name="Acme\BlogBundle\Entity\Author">
    <property name="firstName">
        <constraint name="NotBlank" />
    </property>
</class>
  • PHP
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    // src/Acme/BlogBundle/Entity/Author.php
namespace Acme\BlogBundle\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.

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