Save the contents of a textarea into a text file with Ruby

In a little Sinatra app I'm working on, I want to store what I write in a textarea into a text file. What's the simplest开发者_JAVA百科 way to do this?

In your post handler (you have it, right?) just dump whatever has been passed through your form field into a file:

post '/' do
  File.open('name_of_the_file.txt', 'w') do |f|
    f.write params[:name_of_your_textarea]
  end
end