/modules
  /mywholesale
    mywholesale.php
    /views
      /templates
        /admin
          // 可选：如果需要自定义显示，可以在这里放twig文件

<?php
/**
 * 2007-2020 PrestaShop
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * https://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@prestashop.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
 * versions in the future. If you wish to customize PrestaShop for your
 * needs please refer to https://www.prestashop.com for more information.
 *
 * @author    PrestaShop SA <contact@prestashop.com>
 * @copyright 2007-2020 PrestaShop SA
 * @license   https://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0)
 * International Registered Trademark & Property of PrestaShop SA
 */

if (!defined('_PS_VERSION_')) {
    exit;
}

class MyWholesale extends Module
{
    public function __construct()
    {
        $this->name = 'mywholesale';
        $this->tab = 'front_office_features';
        $this->version = '1.0.0';
        $this->author = 'Your Name';
        $this->need_instance = 0;
        $this->bootstrap = true;

        parent::__construct();

        $this->displayName = $this->l('Wholesale Price Column');
        $this->description = $this->l('Adds a wholesale price column to the product catalog list in the back office.');

        $this->confirmUninstall = $this->l('Are you sure you want to uninstall?');
    }

    /**
     * Don't forget to create update methods if needed:
     * http://doc.prestashop.com/display/PS16/Enabling+the+Auto-Update
     */
    public function install()
    {
        if (parent::install() && $this->registerHook('actionAdminProductsListingFieldsModifier')) {
            return true;
        }
        return false;
    }

    public function uninstall()
    {
        if (!parent::uninstall()) {
            return false;
        }
        return true;
    }

    /**
     * Hook to modify the product listing fields and data in the back office.
     *
     * @param array $params Contains 'fields' (column definitions) and 'list' (product data).
     */
    public function hookActionAdminProductsListingFieldsModifier(array &$params)
    {
        // 1. Add the new column definition
        $params['fields']['wholesale_price'] = [
            'title' => $this->l('Wholesale Price'),
            'align' => 'text-center',
            'class' => 'fixed-width-xl', // Adjust width as needed
            'type' => 'price', // 'text', 'decimal', 'price' etc.
            'orderby' => true, // Make it sortable
            'search' => false, // Not searchable by default
        ];

        // 2. Iterate through the products to inject wholesale price data
        foreach ($params['list'] as &$product) {
            // Ensure product ID is available
            if (isset($product['id_product'])) {
                // Load the full Product object to get wholesale_price
                $productObj = new Product($product['id_product'], false, $this->context->language->id);

                // Add wholesale_price to the product data array
                // Format as currency if type is 'price'
                $product['wholesale_price'] = Tools::displayPrice($productObj->wholesale_price, $this->context->currency);
            } else {
                $product['wholesale_price'] = $this->l('N/A'); // Fallback if ID is missing
            }
        }
    }
}