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  4. Constraints
  5. Valid

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Read the updated version of this page for Symfony 5.3 (the current stable version).

Valid

2.2 version
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Valid

This constraint is used to enable validation on objects that are embedded as properties on an object being validated. This allows you to validate an object and all sub-objects associated with it.

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

Basic Usage

In the following example, create two classes Author and Address that both have constraints on their properties. Furthermore, Author stores an Address instance in the $address property.

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// src/Acme/HelloBundle/Entity/Address.php
namespace Amce\HelloBundle\Entity;

class Address
{
    protected $street;
    protected $zipCode;
}

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// src/Acme/HelloBundle/Entity/Author.php
namespace Amce\HelloBundle\Entity;

class Author
{
    protected $firstName;
    protected $lastName;
    protected $address;
}
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    # src/Acme/HelloBundle/Resources/config/validation.yml
Acme\HelloBundle\Entity\Address:
    properties:
        street:
            - NotBlank: ~
        zipCode:
            - NotBlank: ~
            - Length:
                max: 5

Acme\HelloBundle\Entity\Author:
    properties:
        firstName:
            - NotBlank: ~
            - Length:
                min: 4
        lastName:
            - NotBlank: ~
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    // src/Acme/HelloBundle/Entity/Address.php
namespace Acme\HelloBundle\Entity;

use Symfony\Component\Validator\Constraints as Assert;

class Address
{
    /**
     * @Assert\NotBlank()
     */
    protected $street;

    /**
     * @Assert\NotBlank
     * @Assert\Length(max = "5")
     */
    protected $zipCode;
}

// src/Acme/HelloBundle/Entity/Author.php
namespace Acme\HelloBundle\Entity;

class Author
{
    /**
     * @Assert\NotBlank
     * @Assert\Length(min = "4")
     */
    protected $firstName;

    /**
     * @Assert\NotBlank
     */
    protected $lastName;

    protected $address;
}
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    <!-- src/Acme/HelloBundle/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="Acme\HelloBundle\Entity\Address">
        <property name="street">
            <constraint name="NotBlank" />
        </property>
        <property name="zipCode">
            <constraint name="NotBlank" />
            <constraint name="Length">
                <option name="max">5</option>
            </constraint>
        </property>
    </class>

    <class name="Acme\HelloBundle\Entity\Author">
        <property name="firstName">
            <constraint name="NotBlank" />
            <constraint name="Length">
                <option name="min">4</option>
            </constraint>
        </property>
        <property name="lastName">
            <constraint name="NotBlank" />
        </property>
    </class>
</constraint-mapping>
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    // src/Acme/HelloBundle/Entity/Address.php
namespace Acme\HelloBundle\Entity;

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

class Address
{
    protected $street;
    protected $zipCode;

    public static function loadValidatorMetadata(ClassMetadata $metadata)
    {
        $metadata->addPropertyConstraint('street', new Assert\NotBlank());
        $metadata->addPropertyConstraint('zipCode', new Assert\NotBlank());
        $metadata->addPropertyConstraint(
            'zipCode',
            new Assert\Length(array("max" => 5)));
    }
}

// src/Acme/HelloBundle/Entity/Author.php
namespace Acme\HelloBundle\Entity;

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

class Author
{
    protected $firstName;
    protected $lastName;
    protected $address;

    public static function loadValidatorMetadata(ClassMetadata $metadata)
    {
        $metadata->addPropertyConstraint('firstName', new Assert\NotBlank());
        $metadata->addPropertyConstraint('firstName', new Assert\Length(array("min" => 4)));
        $metadata->addPropertyConstraint('lastName', new Assert\NotBlank());
    }
}

With this mapping, it is possible to successfully validate an author with an invalid address. To prevent that, add the Valid constraint to the $address property.

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    # src/Acme/HelloBundle/Resources/config/validation.yml
Acme\HelloBundle\Author:
    properties:
        address:
            - Valid: ~
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    // src/Acme/HelloBundle/Entity/Author.php
namespace Acme\HelloBundle\Entity;

use Symfony\Component\Validator\Constraints as Assert;

class Author
{
    /**
     * @Assert\Valid
     */
    protected $address;
}
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    <!-- src/Acme/HelloBundle/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="Acme\HelloBundle\Entity\Author">
        <property name="address">
            <constraint name="Valid" />
        </property>
    </class>
</constraint-mapping>
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    // src/Acme/HelloBundle/Entity/Author.php
namespace Acme\HelloBundle\Entity;

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

class Author
{
    protected $address;

    public static function loadValidatorMetadata(ClassMetadata $metadata)
    {
        $metadata->addPropertyConstraint('address', new Assert\Valid());
    }
}

If you validate an author with an invalid address now, you can see that the validation of the Address fields failed.

AcmeHelloBundleAuthor.address.zipCode: This value is too long. It should have 5 characters or less

Options

traverse

type: boolean default: true

If this constraint is applied to a property that holds an array of objects, then each object in that array will be validated only if this option is set to true.

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