WARNING: You are browsing the documentation for Symfony 4.2 which is not maintained anymore. Consider upgrading your projects to Symfony 5.1.

Traverse

4.2 version

Maintained

3.4 4.4 5.1 current 5.2 dev

Unmaintained

4.2 4.3 5.0

Traverse
- Basic Usage
- Options
  - payload

Traverse¶

Objects do not validate nested objects by default unless explicitly using this constraint. If only specific nested objects should be validated by cascade, consider using the Valid instead.

Applies to	class
Options	payload
Class	`Symfony\Component\Validator\Constraints\Traverse`

Basic Usage¶

In the following example, create three classes Book, Author and Editor that all have constraints on their properties. Furthermore, Book stores an Author and an Editor instance that must be valid too. Instead of adding the Valid constraint to both fields, configure the Traverse constraint on the Book class.

Annotations

// src/Entity/Book.php
namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;

/**
 * @ORM\Entity
 * @Assert\Traverse
 */
class Book
{
    /**
     * @var Author
     *
     * @ORM\ManyToOne(targetEntity="App\Entity\Author")
     */
    protected $author;

    /**
     * @var Editor
     *
     * @ORM\ManyToOne(targetEntity="App\Entity\Editor")
     */
    protected $editor;

    // ...
}

YAML

# config/validator/validation.yaml
App\Entity\Book:
    constraints:
        - Symfony\Component\Validator\Constraints\Traverse: ~

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\Book">
        <constraint name="Symfony\Component\Validator\Constraints\Traverse"/>
    </class>
</constraint-mapping>

PHP

// src/Entity/Book.php
namespace App\Entity;

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

class Book
{
    public static function loadValidatorMetadata(ClassMetadata $metadata)
    {
        $metadata->addConstraint(new Assert\Traverse());
    }
}

Options¶

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.