Compound

Version: 5.4
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Compound

To the contrary to the other constraints, this constraint cannot be used on its own. Instead, it allows you to create your own set of reusable constraints, representing rules to use consistently across your application, by extending the constraint.

5.1

The Compound constraint was introduced in Symfony 5.1.

Applies to class or property or method
Class Compound
Validator CompoundValidator

Basic Usage

Suppose that you have different places where a user password must be validated, you can create your own named set or requirements to be reused consistently everywhere:

  • Annotations
  • Attributes 
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// src/Validator/Constraints/PasswordRequirements.php
namespace App\Validator\Constraints;

use Symfony\Component\Validator\Constraints\Compound;
use Symfony\Component\Validator\Constraints as Assert;

/**
 * @Annotation
 */
class PasswordRequirements extends Compound
{
    protected function getConstraints(array $options): array
    {
        return [
            new Assert\NotBlank(),
            new Assert\Type('string'),
            new Assert\Length(['min' => 12]),
            new Assert\NotCompromisedPassword(),
        ];
    }
}

Add @Annotation or #[\Attribute] to the constraint class if you want to use it as an annotation/attribute in other classes. If the constraint has configuration options, define them as public properties on the constraint class.

5.2

The ability to use PHP attributes to configure constraints was introduced in Symfony 5.2. Prior to this, Doctrine Annotations were the only way to annotate constraints.

You can now use it anywhere you need it:

  • Annotations
  • Attributes
  • YAML
  • XML
  • PHP 
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// src/Entity/User.php
namespace App\Entity\User;

use App\Validator\Constraints as Assert;

class User
{
    /**
     * @Assert\PasswordRequirements()
     */
    public $plainPassword;
}

Options

groups

type: array | string

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

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.