module ActionDispatch::Routing::PolymorphicRoutes

def polymorphic_path(record_or_hash_or_array, options = {})

polymorphic_url with :routing_type => :path.
Returns the path component of a URL for the given record. It uses 
def polymorphic_path(record_or_hash_or_array, options = {})
  polymorphic_url(record_or_hash_or_array, options.merge(:routing_type => :path))
end