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Front cover of the Symfony 5: The Fast Track book

Symfony 5: The Fast Track

A new book to learn about developing modern Symfony 5 applications.

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  4. Constraints
  5. True
WARNING: You are browsing the documentation for Symfony 2.0 which is not maintained anymore. Consider upgrading your projects to Symfony 4.3.

True

2.0 version
Unmaintained
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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 True
Validator 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 -->
<class name="Acme\BlogBundle\Entity\Author">
    <getter property="tokenValid">
        <constraint name="True">
            <option name="message">The token is invalid.</option>
        </constraint>
    </getter>
</class>
  • 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.

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.