我正在尝试在我的插件中使用缓存。在 ext_localconf.php
if (!is_array($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['myextension'])) {
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['myextension'] = [];}
if (!isset($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['myextension']['frontend'])) {
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['myextension']['frontend'] = 'TYPO3\\CMS\\Core\\Cache\\Frontend\\StringFrontend';}
if (!isset($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['myextension']['options'])) {
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['myextension']['options'] = ['defaultLifetime' => 0];}
if (!isset($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['myextension']['groups'])) {
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['myextension']['groups'] = ['pages'];}
在我的控制器动作中：
$cacheIdentifier = 'topic' . $topic->getUid();
$cache = GeneralUtility::makeInstance(CacheManager::class)->getCache('myextension');
$result = unserialize($cache->get($cacheIdentifier));
if ($result !== false ) {
DebuggerUtility::var_dump($result);
} else {
$result = $this->postRepository->findByTopic($topic->getUid(), $page, $itemsPerPage);
$cache->set($cacheIdentifier, serialize($result), ['tag1', 'tag2']);
DebuggerUtility::var_dump($result);
}
第一次加载该操作的页面时一切正常，并且已在数据库中创建条目（cf_myextension 和 cf_myextension_tags}。
但是第二次缓存被加载，我得到一个错误。甚至DebuggerUtility::var_dump($result);不起作用：
Call to a member function map() on null
in ../typo3/sysext/extbase/Classes/Persistence/Generic/QueryResult.php line 96
*/
protected function initialize()
{
if (!is_array($this->queryResult)) {
$this->queryResult = $this->dataMapper->map($this->query->getType(), $this->persistenceManager->getObjectDataByQuery($this->query));
}
}
/**
正常的 var_dump 工作并吐出缓存条目。问题是什么？我忘记了什么吗？不能将 QueryResult 与其他一些变量一起作为数组存储在缓存中吗？我还尝试了 VariableFrontend 缓存，它产生了同样的错误。