Find all plugins of a specific type and attach fixedPostVars to them

RealUrlAutoconfHook.php

<?php

namespace My\Ext\Hooks;

use TYPO3\CMS\Backend\Utility\BackendUtility;

class RealUrlAutoconfHook {

    /**
     * @param array $params
     * @param       $pObj
     *
     * @return array
     */
    public function addRealUrlConfiguration($params, &$pObj)
    {
        $params = array_merge_recursive(
            $params['config'],
            [
                'fixedPostVars' => [
                    'findConfiguration' => [
                        [
                            'GETvar'      => 'tx_find_find[mangled][country]',
                            'lookUpTable' => [
                                'table'                    => 'static_countries',
                                'id_field'                 => 'uid',
                                'alias_field'              => 'cn_short_de',
                                'useUniqueCache'           => true,
                                'useUniqueCache_conf'      => [
                                    'strtolower'     => true,
                                    'spaceCharacter' => '-',
                                ],
                                'enable404forInvalidAlias' => true,
                            ],
                        ],
                    ],
                ],
            ]
        );
        
        $params = $this->addFixedPostVarsForPlugins($params, $pObj);

        return $params;
    }
    
   /**
     * @param array $params
     * @param       $pObj
     *
     * @return array
     */
    protected function addFixedPostVarsForPlugins($params, &$pObj)
    {
        $findPlugins = BackendUtility::getRecordsByField(
            'tt_content',
            'list_type',
            'find_find',
            'AND CType="list" '
        );

        if ($findPlugins !== false) {
            foreach ($findPlugins as $plugin) {
                $params['fixedPostVars'][$plugin['pid']] = 'findConfiguration';
            }
        }

        return $params;
    }
}