Cover of the book Symfony 5: The Fast Track

Symfony 5: The Fast Track is the best book to learn modern Symfony development, from zero to production. +300 pages showcasing Symfony with Docker, APIs, queues & async tasks, Webpack, SPAs, etc.

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True

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True

Validates that a value is true. Specifically, this checks to see if the value is exactly true, exactly the integer 1, or exactly the string “1”.

Also see False.

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

Basic Usage

This constraint can be applied to properties (e.g. a termsAccepted property on a registration model) or to a “getter” method. It’s most powerful in the latter case, where you can assert that a method returns a true value. For example, suppose you have the following method:

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

class Author
{
    protected $token;

    public function isTokenValid()
    {
        return $this->token == $this->generateToken();
    }
}

Then you can constrain this method with True.

  • YAML
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    # src/Acme/BlogBundle/Resources/config/validation.yml
Acme\BlogBundle\Entity\Author:
    getters:
        tokenValid:
            - 'True': { message: "The token is invalid." }
  • Annotations
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    // src/Acme/BlogBundle/Entity/Author.php
namespace Acme\BlogBundle\Entity;

use Symfony\Component\Validator\Constraints as Assert;

class Author
{
    protected $token;

    /**
     * @Assert\True(message = "The token is invalid")
     */
    public function isTokenValid()
    {
        return $this->token == $this->generateToken();
    }
}
  • XML
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    <!-- src/Acme/Blogbundle/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\BlogBundle\Entity\Author">
        <getter property="tokenValid">
            <constraint name="True">
                <option name="message">The token is invalid.</option>
            </constraint>
        </getter>
    </class>
</constraint-mapping>
  • PHP
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    // src/Acme/BlogBundle/Entity/Author.php
namespace Acme\BlogBundle\Entity;

use Symfony\Component\Validator\Mapping\ClassMetadata;
use Symfony\Component\Validator\Constraints\True;

class Author
{
    protected $token;

    public static function loadValidatorMetadata(ClassMetadata $metadata)
    {
        $metadata->addGetterConstraint('tokenValid', new True(array(
            'message' => 'The token is invalid.',
        )));
    }

    public function isTokenValid()
    {
        return $this->token == $this->generateToken();
    }
}

If the isTokenValid() returns false, the validation will fail.

Caution

When using YAML, be sure to surround True with quotes ('True') or else YAML will convert this into a true Boolean value.

Options

message

type: string default: This value should be true.

This message is shown if the underlying data is not true.

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