Validates that a value is a negative number. Zero is neither positive nor negative, so you must use :doc:`/reference/constraints/NegativeOrZero` if you want to allow zero as value.
The following constraint ensures that the withdraw of a bank account
TransferItem is a negative number (lesser than zero):
.. configuration-block::
.. code-block:: php-attributes
// src/Entity/TransferItem.php
namespace App\Entity;
use Symfony\Component\Validator\Constraints as Assert;
class TransferItem
{
#[Assert\Negative]
protected int $withdraw;
}
.. code-block:: yaml
# config/validator/validation.yaml
App\Entity\TransferItem:
properties:
withdraw:
- Negative: ~
.. code-block:: xml
<!-- 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\TransferItem">
<property name="withdraw">
<constraint name="Negative"></constraint>
</property>
</class>
</constraint-mapping>
.. code-block:: php
// src/Entity/TransferItem.php
namespace App\Entity;
use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\Validator\Mapping\ClassMetadata;
class TransferItem
{
// ...
public static function loadValidatorMetadata(ClassMetadata $metadata): void
{
$metadata->addPropertyConstraint('withdraw', new Assert\Negative());
}
}
type: string default: This value should be negative.
The default message supplied when the value is not less than zero.
You can use the following parameters in this message:
| Parameter | Description |
|---|---|
{{ compared_value }} |
Always zero |
{{ compared_value_type }} |
The expected value type |
{{ value }} |
The current (invalid) value |