verification_overwrite_controller.php

// エラーチェック
$err_flag = false;
$err_mes = array();

if (!$this->Model->saveAll($this->request->data, array('validate'=>'only'))) {
    $err_flag = true;
    $errors = $this->Model->validationErrors;
    foreach ($errors as $error) {
        $err_mes[] = $error[0];
    }
    $err_mes = Set::flatten($err_mes);
}