Routing with an optional parameter

Question

I added in the route file:

map.show_book \"/show_book/:name/year/:year\", :controller => \"book\", :action => \"show_version\"

I also

Answer 1

Put the optional parts between parenthesis:

map.show_book "/show_book/:name(/year/:year)", :controller => "book", :action => "show_version"

and remove the second route.

Update

The above answer is only for rails 3 and above. Inverting the two routes definitions fixed the problem (see Alessandro's comment below).