postItems method

Implementation

Future postItems(List<NsgDataItem> itemsToPost) async {
  if (itemsToPost.isEmpty) {
    return;
  }
  var firstItem = itemsToPost.first;
  var box = await getTable(firstItem.typeName);
  var tableFields = <String>[];
  for (var name in firstItem.fieldList.fields.keys) {
    if (firstItem.fieldList.fields[name] is NsgDataReferenceListField) {
      tableFields.add(name);
    }
  }
  for (var item in itemsToPost) {
    if (item.id.isEmpty) {
      item.id = Guid.newGuid();
    }
    item.state = NsgDataItemState.fill;
    Map<dynamic, dynamic>? oldObject;
    if (tableFields.isNotEmpty) {
      oldObject = await box.get(item.id.toString());
    }
    var map = <String, dynamic>{};
    for (var name in item.fieldList.fields.keys) {
      if (tableFields.contains(name)) {
        var ls = <String>[];
        for (var row in item[name] as List<NsgDataItem>) {
          row.ownerId = item.id;
          ls.add(row.id);
        }
        //Читаем старый объект, извлекаем из него идентификаторы строк таб частей
        //Сравниваем с новыми, удаляем неиспользуемые
        var oldRowsId = oldObject != null ? oldObject[name] : null;
        if (oldRowsId != null && (oldRowsId is List<String>?) && oldRowsId!.isNotEmpty) {
          for (var e in ls) {
            oldRowsId.remove(e);
          }
          if (oldRowsId.isNotEmpty) {
            var tableBox = await getTable((item.getField(name) as NsgDataReferenceListField).referentElementType.toString());
            tableBox.deleteAll(oldRowsId);
          }
        }

        map[name] = ls;
      } else {
        var value = item.fieldList.fields[name];
        map[name] = value!.convertToJson(item[name]);
      }
    }
    await box.put(item.id, map);

    for (var name in tableFields) {
      var list = item[name] as List<NsgDataItem>;
      if (list.isNotEmpty) {
        postItems(list);
      }
    }
  }
  NsgDataClient.client.addItemsToCache(items: itemsToPost);
}