CSV file chunk read with `file_stream!` |> Enum.to_list() returns deeply nested lists about unzip HOT 3 CLOSED

Hey @christopherdbull
Zip.file_stream!/2 returns stream of iodata not binary/string. This is an optimization to avoid building intermediate binary if you are forwarding it to some other IO operation. Most IO operations in elixir/erlang work with iodata to take benefit of this, you can read more about it here. The documentation should mention that chunks are iodata. I will update it to clarify.

But if your usecase wants binary/string then you can just convert using IO.iodata_to_binary

binary_stream =
  Unzip.file_stream!(zipfile, "foo.csv")
  |> Stream.map(&IO.iodata_to_binary/1)

# if you want the whole csv file as string
csv = Enum.into(binary_stream, "")

# if you want csv as list of strings 
csv_lines = Enum.to_list(binary_stream)

from unzip.

Thank you! Got there in the end - via a bit of a practical education on iodata and streams in elixir 😅

from unzip.

I am closing this. But let me know if you still face issues.

from unzip.