计数

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验证给定集合（即数组或实现了 Countable 接口的对象）的元素计数是否在某个最小值和最大值之间。

适用于	属性或方法
类	计数
验证器	CountValidator

基本用法

要验证 emails 数组字段包含 1 到 5 个元素，你可以添加以下内容

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

use Symfony\Component\Validator\Constraints as Assert;

class Participant
{
    #[Assert\Count(
        min: 1,
        max: 5,
        minMessage: 'You must specify at least one email',
        maxMessage: 'You cannot specify more than {{ limit }} emails',
    )]
    protected array $emails = [];
}
    

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        # config/validator/validation.yaml
App\Entity\Participant:
    properties:
        emails:
            - Count:
                min: 1
                max: 5
                minMessage: 'You must specify at least one email'
                maxMessage: 'You cannot specify more than {{ limit }} emails'
    

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

    <class name="App\Entity\Participant">
        <property name="emails">
            <constraint name="Count">
                <option name="min">1</option>
                <option name="max">5</option>
                <option name="minMessage">You must specify at least one email</option>
                <option name="maxMessage">You cannot specify more than {{ limit }} emails</option>
            </constraint>
        </property>
    </class>
</constraint-mapping>
    

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

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

class Participant
{
    // ...

    public static function loadValidatorMetadata(ClassMetadata $metadata): void
    {
        $metadata->addPropertyConstraint('emails', new Assert\Count([
            'min' => 1,
            'max' => 5,
            'minMessage' => 'You must specify at least one email',
            'maxMessage' => 'You cannot specify more than {{ limit }} emails',
        ]));
    }
}
    