def send_batch_notification_email(notifications, options = {})
      return if notifications.blank?
      if notifications.map{ |n| n.target }.uniq == [self]
        Notification.send_batch_notification_email(self, notifications, options)
      end
    end
def send_batch_notification_email(notifications, options = {})
      return if notifications.blank?
      if notifications.map{ |n| n.target }.uniq == [self]
        Notification.send_batch_notification_email(self, notifications, options)
      end
    end
Sends batch notification email to the target.

 @param [Array<Notification>] notifications Target notifications to send batch notification email
 @param [Hash]                options       Options for notification email
 @option options [Boolean]        :send_later  (false)          If it sends notification email asynchronously
 @option options [String, Symbol] :fallback    (:batch_default) Fallback template to use when MissingTemplate is raised
 @option options [String]         :batch_key   (nil)            Key of the batch notification email, a key of the first notification will be used if not specified
 @return [Mail::Message|ActionMailer::DeliveryJob|NilClass] Email message or its delivery job, return NilClass for wrong target