Maks

<?php
$query = $modx->newQuery('msProduct');
$query->select(['msProduct.*']);
$query->where(['class_key' => 'msProduct']);
$query->limit(0);
$resources = $modx->getIterator('modResource',$query);
foreach ($resources as $resource) {
        $productArray['options-available'] = $resource->getTVValue(30);
        $resource->set('available',$tv_available);
        $resource->save();
}

<?php
$query = $modx->newQuery('msProduct');
$query->select(['msProduct.*']);
$query->where(['class_key' => 'msProduct']);
$query->limit(0);
$resources = $modx->getIterator('modResource',$query);
foreach ($resources as $resource) {
      $tv_available = $resource->getTVValue('30');
        $resource->set('available',$tv_available);
        $resource->save();
}