Image edit endpoint does not support array input

[ryankon]

Describe the bug
Per https://platform.openai.com/docs/api-reference/images/createEdit#images-createedit-image, the image edit endpoint supports either a string or an array of files for multiple image edit.

It looks like it currently only supports a string.
https://github.com/alexrudall/ruby-openai/blob/f020cbd5b69d39d24d8ff1b502ad3bb3dae9425c/lib/openai/images.rb#L22C7-L22C74

To Reproduce
Steps to reproduce the behavior:

1. Hit the image edit endpoint with an array

Expected behavior
The image edit endpoint should accept and process multiple files

Additional context
Passing an array raises:
TypeError (no implicit conversion of Array into String)

[FeSens]

Facing the same problem here

[joeytheman]

Here is a quick attempt at adding the functionality to the gem. Not sure if breaks anything else but it does work for this use-case. If you have a Rails app, you can add the file content below to an initializer.

# config/initializers/openai_array_uploads.rb
require 'openai/http'
require 'openai/images'

module OpenAI
  module HTTP
    private

    # Override multipart_parameters to support arrays of UploadIO
    def multipart_parameters(parameters)
      return unless parameters

      parameters.transform_values do |value|
        if value.is_a?(Array)
          value.map { |item| wrap_upload(item) }
        else
          wrap_upload(value)
        end
      end
    end

    def wrap_upload(item)
      return item unless item.respond_to?(:close)
      path = item.respond_to?(:path) ? item.path : nil
      Faraday::UploadIO.new(item, "", path)
    end
  end

  class Images
    private

    def open_files(parameters)
      images      = [parameters[:image]].flatten
      image_files = images.map { |img| File.open(img) }

      parameters = parameters.merge(image: image_files)
      parameters = parameters.merge(mask: File.open(parameters[:mask])) if parameters[:mask]
      parameters
    end
  end
end

[alexrudall]

Thanks @ryankon @FeSens @joeytheman - would you mind trying this PR? #590