[cakephp]テーブル未使用モデルで$this->Model->create()するとエラー吐くよ。

var $useTable = false;

$this->Model->create($this->data);

Warning (512): (Model::getColumnType) Unable to locate model field data. If you are using a model without a database table, try implementing schema() [CORE/cake/libs/model/model.php, line 959]
Code | Context
 
$column	=	"how_know"
$cols	=	array()
 
$cols = $this->schema();
if (empty($cols)) {
    trigger_error(__('(Model::getColumnType) Unable to locate model field data. If you are using a model without a database table, try implementing schema()', true), E_USER_WARNING);
 
Model::getColumnType() - CORE/cake/libs/model/model.php, line 959
Model::deconstruct() - CORE/cake/libs/model/model.php, line 857
Model::set() - CORE/cake/libs/model/model.php, line 839
Model::create() - CORE/cake/libs/model/model.php, line 1014
PartnersController::regist() - APP/controllers/partners_controller.php, line 20
Dispatcher::_invoke() - CORE/cake/dispatcher.php, line 265
Dispatcher::dispatch() - CORE/cake/dispatcher.php, line 237
[main] - APP/webroot/index.php, line 84

$this->data["Model"]["how_know"]

var $useTable = false;
var $_schema = array("how_know"=>array("type"=>"string"));