public function validateJson ($attribute)
		{
			if (!$this->hasErrors())
			{
				if (!( is_string($this->$attribute) && is_array(json_decode($this->$attribute, true)) && ( json_last_error() == JSON_ERROR_NONE ) ))
					$this->addError($attribute, Yii::tr('This field must be well-formed JSON.', [], 'setting'));
			}
		}