Allow StringIO object to be passed to

Author: simonx1

lib/openai/http.rb

@@ -99,10 +99,14 @@ def multipart_parameters(parameters)
       parameters&.transform_values do |value|
         next value unless value.respond_to?(:close) # File or IO object.
 
+        # Faraday::UploadIO does not require a path, so we will pass it
+        # only if it is available. This allows StringIO objects to be
+        # passed in as well.
+        path = value.respond_to?(:path) ? value.path : nil
         # Doesn't seem like OpenAI needs mime_type yet, so not worth
         # the library to figure this out. Hence the empty string
         # as the second argument.
-        Faraday::UploadIO.new(value, "", value.path)
+        Faraday::UploadIO.new(value, "", path)
       end
     end
 

spec/fixtures/cassettes/files_upload.yml

@@ -31,13 +31,21 @@
         it { expect { upload }.to raise_error(ArgumentError) }
       end
 
-      context "with a file content" do
+      context "with a `File` instance content" do
         let(:file) { File.open(File.join(RSPEC_ROOT, "fixtures/files", filename)) }
 
         it "succeeds" do
           expect(upload["filename"]).to eq(filename)
         end
       end
+
+      context "with a `StringIO` instance content" do
+        let(:file) { StringIO.new(File.read(File.join(RSPEC_ROOT, "fixtures/files", filename))) }
+
+        it "succeeds" do
+          expect(upload["filename"]).to eq("local.path")
+        end
+      end
     end
 
     describe "#list" do