title: rails 3 sass compiling
body: <p>Hello I have one question I have my file main.scss which is in public/stylesheets/scss. In documentation is written:</p>
  
  <blockquote>
    <p>By default, .sass and .scss files are
    placed in public/stylesheets/sass
    (this can be customized with the
    :template_location option). Then,
    whenever necessary, they’re compiled
    into corresponding CSS files in
    public/stylesheets. For instance,
    public/stylesheets/sass/main.scss
    would be compiled to
    public/stylesheets/main.css.</p>
  </blockquote>
  
  <p>I have in my gemfile gem 'haml'
  And from my view I do sth like this</p>
  
  <pre><code>= stylesheet_link_tag 'main'
  </code></pre>
  
  <p>And the file is not found when I check the source(there is a file with with information about routing error). I guess that compiling it by hand it is not way to go so how I can make compile scss file to public/stylesheets automatic? What mean in documentation that they are compiled when necessary?
  Thanks in advance</p>