CollectionInputFilter - apply Validator/IsCountable

Questions Components & MVC
1

Hi,
I want to validate min/max count of items in CollectionInputFilter. My config is:

<?php

declare(strict_types=1);

use Laminas\InputFilter;
use Laminas\Validator;

include_once __DIR__ . '/vendor/autoload.php';

$config = [
    'items' => [
        'required' => true,
        'type' => InputFilter\CollectionInputFilter::class,
        'input_filter' => [
            'id' => [
                'required' => true,
            ],
        ],
        'validators' => [
            [
                'name'    => Validator\IsCountable::class,
                'options' => [
                    'max' => 1,
                ],
            ],
        ],
    ],
];

$data = [
    'items' => [
        [
            'id' => 'foo',
        ],
        [
            'id' => 'bar',
        ],
    ],
];

$factory = new InputFilter\Factory();

$inputFilter = $factory->createInputFilter($config);
$inputFilter->setData($data);

var_dump($inputFilter->isValid()); // outputs true

But InputFilterInterface is not validated itself.

Any suggestions how to validate max count of passed $data?

2

Correct, you can not add validators to an input filter or collection input filter itself. An input filter does not have a validator chain like an input.

Unfortunately, I have no real idea at the moment. Maybe a custom input filter which adapts the count option of the collection input filter.

Some pseudo code:

class CustomCollectionInputFilter extends Laminas\InputFilter\CollectionInputFilter
{
    private ?int $min = null;

    private ?int $max = null;

    public function getMin(): ?int
    {
        return $this->min;
    }

    public function setMin(?int $min): void
    {
        $this->min = $min;
    }

    public function getMax(): ?int
    {
        return $this->max;
    }

    public function setMax(?int $max): void
    {
        $this->max = $max;
    }

    public function isValid($context = null): bool
    {
        $valid = true;
        if (is_int($this->getMin()) && count($this->data) < $this->getMin()) {
            $this->collectionMessages[] = '…';
            $valid                      = false;
        }

        if (is_int($this->getMax()) && count($this->data) > $this->getMax()) {
            $this->collectionMessages[] = '…';
            $valid                      = false;
        }

        if (! $valid) {
            return false;
        }

        return parent::isValid($context);
    }
}

$inputFilter = $factory->createInputFilter($config);
$inputFilter->get('items')->setMin(1);
$inputFilter->get('items')->setMax(3);
$inputFilter->setData($data);
3

Thanks for hint. I have another idea. Create InputFilterFilter class. Basically InputFilter which consumes InputFilter object. What do you think?

4

How does it solve the problem of adding validators? Only an input has a validator chain:

And a collection input filter is already an input filter object: