传递给Symfony\Component\Validator\Mapping\GenericMetadata::addConstraint()的参数%1必须是实例，给定的字符串

use Symfony\Component\Validator\Constraints as Assert;

class MyEntity
{
    /**
     * @Assert\Length(min=3, max=255)
     */
    private $name;
}

use Symfony\Component\Validator\Constraint;

/**
 * @Annotation
 */
class MyCustomConstraint extends Constraint
{
    public $message = 'The value "{{ value }}" is not valid.';
}

use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Constraint;

class MyCustomConstraintValidator extends ConstraintValidator
{
    public function validate($value, Constraint $constraint)
    {
        // 在这里实现你的验证逻辑
        if (/* 验证失败的条件 */) {
            $this->context->buildViolation($constraint->message)
                ->setParameter('{{ value }}', $value)
                ->addViolation();
        }
    }
}

use Symfony\Component\Validator\Constraints as Assert;

class MyEntity
{
    /**
     * @Assert\MyCustomConstraint
     */
    private $customField;
}