title: routing via query string in rails 3?
body: <p>i wonder if you can route a request to a specific controller with query string.</p>
  
  <p>eg. if a request contains a querystring "q=hello" then it would be sent to a specific controller.</p>
  
  <p>and if it contains "search=hello" then it would be sent to another controller.</p>
  
  <p>is this possible?</p>
  
  <p>thanks!</p>