Negative

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验证值是否为负数。零既不是正数也不是负数，因此如果要允许零值，则必须使用 NegativeOrZero。

应用于	属性或方法
类	Negative
验证器	LessThanValidator

基本用法

以下约束确保银行账户 TransferItem 的 withdraw 值为负数（小于零）

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

use Symfony\Component\Validator\Constraints as Assert;

class TransferItem
{
    #[Assert\Negative]
    protected int $withdraw;
}
    

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        # config/validator/validation.yaml
App\Entity\TransferItem:
    properties:
        withdraw:
            - Negative: ~
    

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        <!-- config/validator/validation.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<constraint-mapping xmlns="http://symfony.ac.cn/schema/dic/constraint-mapping"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.ac.cn/schema/dic/constraint-mapping http://symfony.ac.cn/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>
    

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        // 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());
    }
}
    