NotBlank

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Validates that a value is not blank - meaning not equal to a blank string, a blank array, null or false:

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        if (false === $value || (empty($value) && '0' != $value)) {
    // validation will fail
}
    

To force that a value is not equal to null, see the NotNull constraint.

Applies to	property or method
Options	groups message payload
Class	NotBlank
Validator	NotBlankValidator

Basic Usage

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

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        // src/AppBundle/Entity/Author.php
namespace AppBundle\Entity;

use Symfony\Component\Validator\Constraints as Assert;

class Author
{
    /**
     * @Assert\NotBlank
     */
    protected $firstName;
}
    

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        # src/AppBundle/Resources/config/validation.yml
AppBundle\Entity\Author:
    properties:
        firstName:
            - NotBlank: ~
    

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        <!-- 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 https://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>
    

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        // src/AppBundle/Entity/Author.php
namespace AppBundle\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\NotBlank());
    }
}
    

Options

`groups`

type: array | string

It defines the validation group or groups this constraint belongs to. Read more about validation groups.

`message`

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

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

You can use the following parameters in this message:

Parameter	Description
`{{ value }}`	The current (invalid) value

`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.

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