fetchPublicChatRoomsFromServer method Null safety

Future<ChatPageResult<ChatRoom>> fetchPublicChatRoomsFromServer(
  1. {int pageNum = 1,
  2. int pageSize = 200}
)

Gets chat room data from the server with pagination.

Param pageNum The page number, starting from 1.

Param pageSize The number of records per page.

Return Chat room data. See {@link ChatPageResult}.

Throws A description of the exception. See {@link ChatError}.

Implementation

Future<ChatPageResult<ChatRoom>> fetchPublicChatRoomsFromServer({
  int pageNum = 1,
  int pageSize = 200,
}) async {
  Map result = await _channel.invokeMethod(
      ChatMethodKeys.fetchPublicChatRoomsFromServer,
      {"pageNum": pageNum, "pageSize": pageSize});
  try {
    ChatError.hasErrorFromResult(result);
    return ChatPageResult<ChatRoom>.fromJson(
        result[ChatMethodKeys.fetchPublicChatRoomsFromServer],
        dataItemCallback: (map) {
      return ChatRoom.fromJson(map);
    });
  } on ChatError catch (e) {
    throw e;
  }
}