How to Translate Validation Constraint Messages
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How to Translate Validation Constraint Messages
The validation constraints used in forms can translate their error messages by
creating a translation resource for the validators
translation domain.
First of all, install the Symfony translation component (if it's not already installed in your application) running the following command:
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$ composer require symfony/translation
Suppose you've created a plain-old-PHP object that you need to use somewhere in your application:
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// src/Entity/Author.php
namespace App\Entity;
class Author
{
public $name;
}
Add constraints through any of the supported methods. Set the message option
to the translation source text. For example, to guarantee that the $name
property is not empty, add the following:
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// src/Entity/Author.php
namespace App\Entity;
use Symfony\Component\Validator\Constraints as Assert;
class Author
{
#[Assert\NotBlank(message: 'author.name.not_blank')]
public $name;
}
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# config/validator/validation.yaml
App\Entity\Author:
properties:
name:
- NotBlank: { message: 'author.name.not_blank' }
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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\Author">
<property name="name">
<constraint name="NotBlank">
<option name="message">author.name.not_blank</option>
</constraint>
</property>
</class>
</constraint-mapping>
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// src/Entity/Author.php
namespace App\Entity;
// ...
use Symfony\Component\Validator\Constraints\NotBlank;
use Symfony\Component\Validator\Mapping\ClassMetadata;
class Author
{
public $name;
public static function loadValidatorMetadata(ClassMetadata $metadata)
{
$metadata->addPropertyConstraint('name', new NotBlank([
'message' => 'author.name.not_blank',
]));
}
}
Now, create a validators
catalog file in the translations/
directory:
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<!-- translations/validators/validators.en.xlf -->
<?xml version="1.0" encoding="UTF-8" ?>
<xliff version="1.2" xmlns="urn:oasis:names:tc:xliff:document:1.2">
<file source-language="en" datatype="plaintext" original="file.ext">
<body>
<trans-unit id="author.name.not_blank">
<source>author.name.not_blank</source>
<target>Please enter an author name.</target>
</trans-unit>
</body>
</file>
</xliff>
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# translations/validators/validators.en.yaml
author.name.not_blank: Please enter an author name.
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// translations/validators/validators.en.php
return [
'author.name.not_blank' => 'Please enter an author name.',
];
You may need to clear your cache (even in the dev environment) after creating this file for the first time.