Files - expires_after was unexpected

[leoplct]

Hello,

According to the documentation, it should be possible to pass an expires_after parameter to automatically delete the file after a certain time.

However, when I include it in my request, I get the following error:

$openai = OpenAI::Client.new(
  api_key: Rails.application.credentials.openai,
  max_retries: 1
)

$openai.files.create(
  file: download,
  purpose: "user_data", 
   expires_after: {anchor: 'created_at', seconds: 3600}
 )

private 

  def download
    file = Tempfile.new([ "upload", ".pdf" ])
    file.binmode
    file.write(@file.download)
    file.rewind
    Pathname(file.path)
  end

Response

{:url=>"https://api.openai.com/v1/files", :status=>400, :body=>{:error=>{:message=>"Additional properties are not allowed ('expires_after' was unexpected)", :type=>"invalid_request_error", :param=>nil, :code=>nil}}} (OpenAI::Errors::BadRequestError)

[bugtender]

Hi, I’m running into the same issue. 👋

When I upload a file with an expires_after parameter, it works fine using curl:

curl -v https://api.openai.com/v1/files \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -F purpose="user_data" \
  -F file="@test.jsonl" \
  -F "expires_after[anchor]=created_at" \
  -F "expires_after[seconds]=2592000"

But when doing the same request using openai-ruby, it will failed

path = Pathname("./test.jsonl")

client.files.create(
  purpose: "user_data",
  file: path,
  expires_after: { anchor: "created_at", seconds: 2592000 }
)

The Ruby SDK treats expires_after as a single key in the multipart body,
while the API expects bracketed multipart field names like expires_after[anchor] and expires_after[seconds].
It looks like the SDK needs a small adjustment in how it builds or encodes multipart form fields for nested parameters.

It also seems like the Python SDK handles this case correctly (1, 2),
so this might be a Ruby specific issue in the code generation or multipart encoding layer. 🤔