laravel eloquent 判断索引是否存在并强制指定索引进行查询

/**
 * 检测某个表中是否存在某个索引
 * @param $table
 * @param $index
 * @return bool
 * @author zhaohao
 * @date 2019-08-26 17:42
 */
if(!function_exists('hasIndex')) {
    function hasIndex($table, $name)
    {
        $conn = IlluminateSupportFacadesSchema::getConnection();
        $dbSchemaManager = $conn->getDoctrineSchemaManager();
        $doctrineTable = $dbSchemaManager->listTableDetails($table);
        return $doctrineTable->hasIndex($name);
    }
}

->from(DB::raw('`erp_agents` FORCE INDEX (`test`)'))

$agents = Agent::where($whereType)
            ->when(hasIndex('Agent', 'test'),function ($q){
                $q->from(DB::raw('`erp_agents` FORCE INDEX (`test`)'));
            })
            ->when(request('position',false),function ($q){
                $q->whereIn('position_id',request('position'));
            })
            ->whereIn('agents.status', $validStatus)
            ->where('worked_at', '<=', $end)
            ->where('is_suppose', 0)
            ->addDomination('m.statistics-human-view')
            ->leftJoin('positions', 'positions.id', '=', 'agents.position_id')
            ->get(['worked_days', 'worked_at']);