在 extbase TYPO3 前端插件中过滤选定的类别和子类别

Question

我正在使用TYPO3 8.7。

我有一个允许列出事件的扩展。在插件设置列表中，编校者选择类别。他希望分配了所选类别或其子类别的所有事件都显示在前端中。

我一直在阅读 docs.typo3.org 上的文档，并一直在查看课程

CategoryCollection

。据我了解，这个类可以帮助我获取某个记录的关键字，但不能帮助我通过关键字选择记录。

我还想过滤子类别，因为它使扩展的处理更加容易。让我们想象一下以下事件类别：

• 学习课程
  • 硕士学位
  • 学士学位
• 培训
  • 内部培训
  • 外部培训

后端编辑器希望可以选择显示其中一个，例如内部培训或所有培训，无需明确激活每个事件的父类别。

在 extbase 存储库中过滤类别及其子类别以在前端显示记录列表的正确方法是什么？

我是否必须手动实现逻辑来过滤类别和子类别？

Answer 1

我的解决方案如下所示：

<?php
namespace Snowflake\Events\Domain\Repository;

/***************************************************************
*  Copyright notice
*
*  (c) 2018 snowflake productions gmbh <[email protected]>
*  All rights reserved
*
*  This script is part of the TYPO3 project. The TYPO3 project is
*  free software; you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation; either version 2 of the License, or
*  (at your option) any later version.
*
*  The GNU General Public License can be found at
*  http://www.gnu.org/copyleft/gpl.html.
*
*  This script is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*  GNU General Public License for more details.
*
*  This copyright notice MUST APPEAR in all copies of the script!
***************************************************************/

use TYPO3\CMS\Core\Database\ConnectionPool;
use TYPO3\CMS\Core\Database\Query\QueryBuilder;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Extbase\Persistence\Repository;

class EventRepository extends Repository {

    /**
     * @param $categories
     * @return array|\TYPO3\CMS\Extbase\Persistence\QueryResultInterface
     * @throws \TYPO3\CMS\Extbase\Persistence\Exception\InvalidQueryException
     */
    public function findByCategoryFilter($categories)
    {
        $categories = array_map('intval', explode(',', $categories));
        $categories = $this->expandCategories($categories);
        $uids = $this->getUidsByCategories($categories);
        if (count($uids) == 0)
            return array();
        $query = $this->createQuery();
        $query->matching(
            $query->in('uid', $uids)
        );
        return $query->execute(true);
    }

    /**
     * Return the categories and all subcategories (recursive)
     *
     * @param $categories
     * @return array
     */
    private function expandCategories($categories)
    {
        // get all categories from database
        /** @var QueryBuilder $queryBuilder */
        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
            ->getQueryBuilderForTable('sys_category');
        $queryBuilder->getRestrictions()->removeAll();
        $queryBuilder
            ->select('uid', 'parent')
            ->from('sys_category');
        $allCategoriesFromDatabase = $queryBuilder->execute()->fetchAll();

        // index the categories by parent
        $categoriesByParent = array();
        foreach($allCategoriesFromDatabase as $categoryFromDatabase) {
            $categoriesByParent[(int)$categoryFromDatabase['parent']][] = (int)$categoryFromDatabase['uid'];
        }

        // expand the categories to all subcategories
        $categoriesToExpand = $categories;
        $expandedCategories = $categories;
        while(count($categoriesToExpand) > 0) {
            $currentSubCategories = array();
            foreach($categoriesToExpand as $category) {
                foreach ($categoriesByParent[$category] as $subCategory) {
                    $currentSubCategories[] = $subCategory;
                }
            }
            $categoriesToExpand = array_diff($currentSubCategories, $expandedCategories);
            $expandedCategories = array_unique(array_merge($expandedCategories, $currentSubCategories));
        }

        return $expandedCategories;
    }

    /**
     * This is a workaround because
     *
     *  $query = $this->createQuery();
     *     $query->matching(
     *     $query->contains('category', $categories)
     *  );
     *  return $query->execute(true);
     *
     * generate a useless SQL query (equals instead of in, see first WHERE condition in subquery)
     *
     * SELECT `tx_events_domain_model_event`.*
     * FROM `tx_events_domain_model_event` `tx_events_domain_model_event`
     * WHERE (`tx_events_domain_model_event`.`uid` IN
     *   (SELECT `uid_foreign`
     *   FROM `sys_category_record_mm`
     *   WHERE (`uid_local` = '1,3,5,4,6')
     *   AND ((`sys_category_record_mm`.`tablenames` = 'tx_events_domain_model_event')
     *   AND (`sys_category_record_mm`.`fieldname` = 'category'))))
     *   AND (`tx_events_domain_model_event`.`sys_language_uid` IN (0, -1))
     *   AND (`tx_events_domain_model_event`.`pid` = 161)
     *   AND ((`tx_events_domain_model_event`.`deleted` = 0)
     *   AND (`tx_events_domain_model_event`.`hidden` = 0)
     *   AND (`tx_events_domain_model_event`.`starttime` <= 1516715340)
     *   AND (
     *     (`tx_events_domain_model_event`.`endtime` = 0)
     *     OR (`tx_events_domain_model_event`.`endtime` > 1516715340)))
     *
     * @param $categories
     * @return array
     */
    private function getUidsByCategories($categories) {
        $result = array();
        /** @var QueryBuilder $queryBuilder */
        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
            ->getQueryBuilderForTable('sys_category_record_mm');
        $queryBuilder->getRestrictions()->removeAll();
        $queryBuilder
            ->select('uid_foreign')
            ->from('sys_category_record_mm')
            ->where(
                $queryBuilder->expr()->andX(
                    $queryBuilder->expr()->in('uid_local', $categories),
                    $queryBuilder->expr()->eq('tablenames', '\'tx_events_domain_model_event\''),
                    $queryBuilder->expr()->eq('fieldname', '\'category\'')
                )
            );
        $records = $queryBuilder->execute()->fetchAll();
        foreach($records as $record) {
            $result[] = $record['uid_foreign'];
        }
        return $result;
    }
}