tips for manipulating streams in dart

README.md

tips for manipulating streams in dart

combine_nested_stream.dart

  return CartOptionCategoryRepository.getAllCartOptionCategoryIDsStream(
    userID: params.userID,
    cartItemID: params.cartItemID,
  ).flatMap((cocIDs) {
    return Rx.combineLatestList([
      for (final cocID in cocIDs)
        CartOptionRepository.getAllCartOptionsStream(
          userID: params.userID,
          cartItemID: params.cartItemID,
          cartOptionCategoryID: cocID,
        ).map(
          (cos) => cos.map(
            (co) => SelectedCartOption(
              cartOptionCategoryID: cocID,
              cartOption: co,
            ),
          ),
        ), //selectedCartOptionのstream
    ]).map((event) => event.expand((el) => el).toList());
  });
});