Rails - Mar 2008 - Read session in a view

I would like to be able to hide a edit and add link on a index page
based on if a user is logged in or not. is this possible and if so
could you help?
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Set the user id in session and use that in your index page to hide or
enable links.

<% if session[:user_id] %>
   //show or hide links
<% end %>
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