Ruby sort_by

gistfile1.rb

pdf_info = {
  "John"=>{"format_b"=>{"file_z"=>{:quantity=>1, :free=>false}, "file_f"=>{:quantity=>1, :free=>true}}},
  "Brunto"=>{"format_a"=>{"file_w"=>{:quantity=>1, :free=>false}, "file_g"=>{:quantity=>1, :free=>true}}}
}

new_pdf_info = {}

pdf_info = pdf_info.sort_by {|k| k}

pdf_info.each do |customer, format_orders|
  new_pdf_info[customer] = {}
  format_orders.each do |format, orders|
    new_pdf_info[customer][format] = {}
    new_pdf_info[customer][format] = Hash[orders.sort_by {|k| k}]
  end
end