[Rails] polymorphic_url with map.resource rails 2.3

In a rails 2.3 app when i do a polymorphic_url with a model that is
mapped with map.resource instead of map.resources I am getting a funky
url

"http://test.host/first_aider.%23%3Cfirstaider:0xb6f12578%3E"

where I want
http://test.host/first_aider

is there a valid way to do this

cheers

Stephen

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