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public function rules()
	{
		return array(
			// all the required fields
			array('content, created_on_utc', 'required'),

			// foreign keys
			array('user_id', 'exist', 'allowEmpty'=>false, 'className'=>'User', 'attributeName'=>'id'),
                        array('deal_id', 'exist', 'allowEmpty'=>false, 'className'=>'Deal', 'attributeName'=>'id'),

			// the dates
			array('created_on_utc', 'date', 'allowEmpty'=>false, 'format'=>ZUtil::MYSQL_DATETIME_FORMAT),
		);
	}