def group_notifier_count(limit = ActivityNotification.config.opened_index_limit)
      notification = group_member? && group_owner.present? ? group_owner : self
      notification.notifier.present? ? group_member_notifier_count(limit) + 1 : 0
    end
def group_notifier_count(limit = ActivityNotification.config.opened_index_limit)
      notification = group_member? && group_owner.present? ? group_owner : self
      notification.notifier.present? ? group_member_notifier_count(limit) + 1 : 0
    end
Returns count of group member notifiers including group owner notifier.
 It always returns 0 if group owner notifier is blank.
 This method is designed to cache group by query result to avoid N+1 call.

 @param [Integer] limit Limit to query for opened notifications
 @return [Integer] Count of group notifications including owner and members