newsupernova/vendor/magento/module-tax/Model/ResourceModel/TaxClass/Collection.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

/**
 * Tax class collection
 *
 * @author      Magento Core Team <core@magentocommerce.com>
 */
namespace Magento\Tax\Model\ResourceModel\TaxClass;

class Collection extends \Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection
{
    /**
     * Resource initialization
     *
     * @return void
     */
    public function _construct()
    {
        $this->_init(\Magento\Tax\Model\ClassModel::class, \Magento\Tax\Model\ResourceModel\TaxClass::class);
    }

    /**
     * Add class type filter to result
     *
     * @param int $classTypeId
     * @return $this
     */
    public function setClassTypeFilter($classTypeId)
    {
        return $this->addFieldToFilter('main_table.class_type', $classTypeId);
    }

    /**
     * Retrieve option array
     *
     * @return array
     */
    public function toOptionArray()
    {
        return $this->_toOptionArray('class_id', 'class_name');
    }

    /**
     * Retrieve option hash
     *
     * @return array
     */
    public function toOptionHash()
    {
        return $this->_toOptionHash('class_id', 'class_name');
    }
}