title: Ruby on Rails - Can I modify data before it is saved?
body: <p>Quick example: A user enters a username into a form, and I need to make that text username before storing it in the app's database, thereby making it permanently lowercase.</p>
  
  <p>Where would I put this code, and how would I access the data to be lowercased?</p>
  
  <p>Thanks.</p>