Twig Constraint

7.3

The Twig constraint was introduced in Symfony 7.3.

Validates that a given string contains valid Twig syntax. This is particularly useful when template content is user-generated or configurable, and you want to ensure it can be rendered by the Twig engine.

Note

Using this constraint requires having the symfony/twig-bridge package installed in your application (e.g. by running composer require symfony/twig-bridge).

Applies to	property or method
Class	Twig
Validator	TwigValidator

Basic Usage

Apply the Twig constraint to validate the contents of any property or the returned value of any method:

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        use Symfony\Bridge\Twig\Validator\Constraints\Twig;

class Template
{
    #[Twig]
    private string $templateCode;
}
    

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

use Symfony\Bridge\Twig\Validator\Constraints\Twig;

class Page
{
    #[Twig]
    private string $templateCode;
}
    

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        # config/validator/validation.yaml
App\Entity\Page:
    properties:
        templateCode:
            - Symfony\Bridge\Twig\Validator\Constraints\Twig: ~
    

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        <!-- 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\Page">
        <property name="templateCode">
            <constraint name="Symfony\Bridge\Twig\Validator\Constraints\Twig"/>
        </property>
    </class>
</constraint-mapping>
    

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

use Symfony\Bridge\Twig\Validator\Constraints\Twig;
use Symfony\Component\Validator\Mapping\ClassMetadata;

class Page
{
    // ...

    public static function loadValidatorMetadata(ClassMetadata $metadata): void
    {
        $metadata->addPropertyConstraint('templateCode', new Twig());
    }
}
    

Constraint Options

`message`

type: message default: This value is not a valid Twig template.

This is the message displayed when the given string does not contain valid Twig syntax:

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        // ...

class Page
{
    #[Twig(message: 'Check this Twig code; it contains errors.')]
    private string $templateCode;
}
    

This message has no parameters.

`skipDeprecations`

type: boolean default: true

If true, Twig deprecation warnings are ignored during validation. Set it to false to trigger validation errors when the given Twig code contains any deprecations:

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        // ...

class Page
{
    #[Twig(skipDeprecations: false)]
    private string $templateCode;
}
    

This can be helpful when enforcing stricter template rules or preparing for major Twig version upgrades.

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

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