CakePHPのValidationのエラー情報を取得

いつも忘れるのでメモ

Validationのエラーは$model->validationErrorsに入っている
http://api.cakephp.org/2.4/class-Model.html#$validationErrors

<?php

class UsersController extends AppController {
    public function add() {
        if ($this->request->is('post')) {
            $this->User->create();
            if ($this->User->save($this->request->data)) {
                $msg = __('The user has been saved.' );
                $this->Session->setFlash($msg);
                $this->redirect(array('action' => 'index'));
            } else {
                $this->Session->setFlash(__('The user data could not be saved. Please, try again.'));

                // validationエラーをログに残す
                $this->log("validationErrors=" . var_export($this->User->validationErrors, true));
            }
        }
    }
}