symfony - 断言验证空数组集合 symfony

Question

有没有办法验证和检查集合数组是否为空。我已经尝试过:

/**
 * @Assert\NotBlank()
 * @Assert\Length( min = 1)
 */
protected $workPlaces;


public function __construct()
{
    $this->workPlaces = new ArrayCollection();

}

Answer 1

尝试使用 Count assert

// 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 $emails = [];
}

Validates that a given collection’s (i.e. an array or an object thatimplements Countable) element count is between some minimum andmaximum value.

不指定 max如果你不需要它。