fetchChatThreadsWithParentId method Null safety

Future<EMCursorResult<EMChatThread>> fetchChatThreadsWithParentId(
  1. {required String parentId,
  2. String? cursor,
  3. int limit = 20}
)

Get the subareas under a group from the server

Param parentId Parent ID, generally refers to group ID.

Param cursor The initial value can be empty or empty string.

Param limit The number of fetches at one time. Value range (0, 50].

Return result of {@link EMCursorResult}), including the cursor for getting data next time and the chat thread object list.

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

Implementation

Future<EMCursorResult<EMChatThread>> fetchChatThreadsWithParentId({
  required String parentId,
  String? cursor,
  int limit = 20,
}) async {
  Map req = {
    "parentId": parentId,
    "pageSize": limit,
  };
  req.setValueWithOutNull("cursor", cursor);
  Map result = await _channel.invokeMethod(
      ChatMethodKeys.fetchChatThreadsWithParentId, req);
  try {
    EMError.hasErrorFromResult(result);
    return EMCursorResult.fromJson(
        result[ChatMethodKeys.fetchChatThreadsWithParentId],
        dataItemCallback: (map) {
      return EMChatThread.fromJson(map);
    });
  } on EMError catch (e) {
    throw e;
  }
}