save method Null safety

Future<LCObject> save({bool fetchWhenSave = false, LCQuery<LCObject>? query})

Saves the object to the cloud.

Can also specify whether to fetchWhenSave, or only saving the object when it matches the query.

Implementation

Future<LCObject> save(
    {bool fetchWhenSave = false, LCQuery<LCObject>? query}) async {
  // 检测循环依赖
  if (_LCBatch.hasCircleReference(this)) {
    throw new ArgumentError('Found a circle dependency when save.');
  }

  // 保存对象依赖
  Queue<_LCBatch> batches = _LCBatch.batchObjects([this], false);
  if (batches.length > 0) {
    await _saveBatches(batches);
  }

  // 保存对象本身
  String path = objectId == null
      ? 'classes/$className'
      : 'classes/$className/$objectId';
  Map<String, dynamic> queryParams = {};
  if (fetchWhenSave) {
    queryParams['fetchWhenSave'] = true;
  }
  if (query != null) {
    queryParams['where'] = query._buildWhere();
  }
  Map<String, dynamic> response = objectId == null
      ? await LeanCloud._httpClient.post(path,
          data: _LCEncoder.encode(_operationMap), queryParams: queryParams)
      : await LeanCloud._httpClient.put(path,
          data: _LCEncoder.encode(_operationMap), queryParams: queryParams);
  _LCObjectData data = _LCObjectData.decode(response);
  _merge(data);
  return this;
}