Rails – open a file, read it and write it to a temp file

tmp.rb

module Tmp
  def self.build(src:, name:, ext:, binmode: false)
    file = Tempfile.new([name, ext], Rails.root.join('tmp'))
    file.binmode if binmode
    open(src) { |f| file.write(f.read) }
    file.rewind
    file.close
    file
  end
end