Create text file example

text_file.rb

# Create basic text file
# http://ruby-doc.org/core-2.2.0/File.html
datos = [1, 2, 3, 4, 5, 7, 8]
File.open("path/to/ejemplo.txt", "w") do |f|
  datos.each do |dato|
    f.puts "Dato #{dato}"
  end
end


# then on http response 
# http://apidock.com/rails/ActionController/Streaming/send_file
send_file 'path/to/ejemplo.txt'