Added SafeValidator.

framework/yii/validators/SafeValidator.php

+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\validators;
+
+/**
+ * SafeValidator serves as a dummy validator whose main purpose is to mark the attributes to be safe for massive assignment.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class SafeValidator extends Validator
+{
+	/**
+	 * @inheritdoc
+	 */
+	public function validateAttribute($object, $attribute)
+	{
+	}
+}

framework/yii/validators/Validator.php

@@ -35,6 +35,7 @@ use yii\base\NotSupportedException;
  * - `integer`: [[NumberValidator]]
  * - `match`: [[RegularExpressionValidator]]
  * - `required`: [[RequiredValidator]]
+ * - `safe`: [[SafeValidator]]
  * - `string`: [[StringValidator]]
  * - `unique`: [[UniqueValidator]]
  * - `url`: [[UrlValidator]]
@@ -66,6 +67,7 @@ abstract class Validator extends Component
 		'match' => 'yii\validators\RegularExpressionValidator',
 		'number' => 'yii\validators\NumberValidator',
 		'required' => 'yii\validators\RequiredValidator',
+		'safe' => 'yii\validators\SafeValidator',
 		'string' => 'yii\validators\StringValidator',
 		'unique' => 'yii\validators\UniqueValidator',
 		'url' => 'yii\validators\UrlValidator',