ExpressionSyntax

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此約束條件檢查值是否為有效的 ExpressionLanguage 表達式。

適用於	屬性或方法
類別	ExpressionSyntax
驗證器	ExpressionSyntaxValidator

基本用法

以下約束條件確保

promotion 屬性儲存的值是有效的 ExpressionLanguage 表達式；
shippingOptions 屬性也確保表達式僅使用特定變數。

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

use Symfony\Component\Validator\Constraints as Assert;

class Order
{
    #[Assert\ExpressionSyntax]
    protected string $promotion;

    #[Assert\ExpressionSyntax(
        allowedVariables: ['user', 'shipping_centers'],
    )]
    protected string $shippingOptions;
}
    

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        # config/validator/validation.yaml
App\Entity\Order:
    properties:
        promotion:
            - ExpressionSyntax: ~
        shippingOptions:
            - ExpressionSyntax:
                allowedVariables: ['user', 'shipping_centers']
    

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

    <class name="App\Entity\Order">
        <property name="promotion">
            <constraint name="ExpressionSyntax"/>
        </property>
        <property name="shippingOptions">
            <constraint name="ExpressionSyntax">
                <option name="allowedVariables">
                    <value>user</value>
                    <value>shipping_centers</value>
                </option>
            </constraint>
        </property>
    </class>
</constraint-mapping>
    

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

use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\Validator\Mapping\ClassMetadata;

class Order
{
    // ...

    public static function loadValidatorMetadata(ClassMetadata $metadata): void
    {
        $metadata->addPropertyConstraint('promotion', new Assert\ExpressionSyntax());

        $metadata->addPropertyConstraint('shippingOptions', new Assert\ExpressionSyntax([
            'allowedVariables' => ['user', 'shipping_centers'],
        ]));
    }
}
    