class ActiveStorage::Transformers::MiniMagickTransformer

def pass_transform_argument(command, method, argument)
  if argument == true
    command.public_send(method)
  elsif argument.present?
    command.public_send(method, argument)
  end
end

def process(file, format:)
  image = MiniMagick::Image.new(file.path, file)
  transformations.each do |name, argument_or_subtransformations|
    image.mogrify do |command|
      if name.to_s == "combine_options"
        argument_or_subtransformations.each do |subtransformation_name, subtransformation_argument|
          pass_transform_argument(command, subtransformation_name, subtransformation_argument)
        end
      else
        pass_transform_argument(command, name, argument_or_subtransformations)
      end
    end
  end
  image.format(format) if format
  image.tempfile.tap(&:open)
end