我正在使用TYPO3 8.7。
我有一个允许列出事件的扩展程序。在列表插件设置中，编辑器选择类别。他希望所有具有所选类别或其子类别的事件都显示在前端。
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，但无法通过关键字选择记录。
我想过滤子类别，因为它使扩展的处理更容易。让我们假设以下事件类别：
后端编辑想要选择显示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？
我是否必须手动实施逻辑以过滤类别和子类别？
答案 0 :(得分：1)
我的解决方案如下：
<?php
namespace Snowflake\Events\Domain\Repository;
/***************************************************************
* Copyright notice
*
* (c) 2018 snowflake productions gmbh <support@snowflake.ch>
* 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;
}
}