Recursive Nette Schema structure

recursive-schema.php

<?php

declare(strict_types=1);

use Nette\Schema\Elements\Type;
use Nette\Schema\Expect;

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

$childrenList = (new Type('array'))->default([]);

$childrenSchema = Expect::structure(
    [
        'id' => Expect::int()->required(),
        'parent_id' => Expect::int()->required(),
        'child_id' => Expect::int()->required(),
        'class' => Expect::string()->required(),
        // ...
        'children' => $childrenList,
    ]
);

$childrenList->items($childrenSchema);

$schema = [
    'type' => Expect::string()->required(),
    'widget' => Expect::structure(
        [
            'id' => Expect::int()->required(),
            'name' => Expect::string()->required(),
            'ico' => Expect::string()->required(),
            'category' => Expect::int()->required(),
            'children' => $childrenList,
        ]
    ),
];

var_export($schema);