根据后台账户权限role name 得到这个权限下面的所有的后台账户

//权限组的名字。
$role_name = "Customer Service";
    $role_parent_id = Mage::getModel('admin/roles')->getCollection()
    ->addFieldToFilter("role_name",array("eq"=>$role_name))->getFirstItem()->getRoleId();
    $resource = Mage::getSingleton('core/resource');
$connection = $resource->getConnection('core_read');
$sql = "SELECT user_id FROM " . $resource->getTableName('admin_role') . " WHERE parent_id = ?";
$ee = $connection->query($sql, array($role_parent_id));
$user_id_array = array();
foreach($ee as $e){
$user_id_array[] = $e['user_id'];
}
    //Customer Service 这个权限组的所有用户collection；
    $role_user_coll = Mage::getModel("admin/user")->getCollection()
//->addFieldToFilter("language",array("eq"=>$language))
->addFieldToFilter("user_id",array("in"=>$user_id_array));