title: Rails initialize default value in session
body: <p>I have a web application, and i want to store user prefered stylesheet in session, and i need to fill it by default to some default till user not log-in or etc. For this purpouses i use session (probably not best solution but it does not matter), and i need a place where i can initialize this variable. Example :</p>
  
  <pre><code>session[:user_theme] = 'default.css' 
  </code></pre>
  
  <p>i dont want to check it every time before filter in some function, i want to initialize it once and then only change via UI. 
  Can you help me to find better place to do that?</p>