How to retrieve reference to AWS::S3::MultipartUpload with ruby -

i have rails app , in controller action able create multipart upload so:

  def create     s3 = aws::s3.new     bucket = s3.buckets["my_bucket"]     key = "some_new_file_name.ext"     obj = bucket.objects[key]     mpu = obj.multipart_upload     render json: {       :id => mpu.id     }   end 

so client has multipart upload id , can upload parts aws browser. wish create action assemble parts once done uploading. like:

  def assemble     s3 = aws::s3.new     bucket = s3.buckets["my_bucket"]     key = params['key']     bucket.objects[key].multipart_upload.complete     render json: { :status => "all good" }   end 

this isn't working though. how retrieve reference multipartupload object or create new 1 key or id can call "complete" method on it? insight appreciated

i found method in documentation client class , got work follows:

client = aws::s3::client.new  # reassemble partslist partslist = [] params[:partslist].each |key, pair|   partslist.push pair end  options = {   :bucket_name => 'my_bucket',   :key => params[:key],   :upload_id => params[:upload_id],   :parts => partslist } client.complete_multipart_upload(options)