factory Request.fromFirestore(DocumentSnapshot doc) {
    Map data = doc.data;

    return Request(
      id: doc.documentID,
      from_date: data['from_date'] ?? '',
      to_date: data['to_date'] ?? '',
      leave_type: data['leave_type'] ?? '',
      reason: data['reason'] ?? '',
      user_id: data['user_id'] ?? '',
      user_name: data['user_name'] ?? '',
      status: data['status'],
	  leave_count: data['leave_count'] ?? 0,
      supervisor_id: data['supervisor_id'],
    );
  }