title: Rails3 routing: how to direct two requests to a single entry point
body: <p>In my controller I would like to use the same code for the new and edit requests. Like this:</p>
  
  <pre><code>def edit
    @tag= Tag.find(params[:id]) || Tag.new
  end
  </code></pre>
  
  <p>My question is: how do I indicate this in routes.rb (Rails3)?</p>