def code_object(url)
      sha = url_key url
      if o = @url_bucket.get(sha, :r => 1)
        fix_url_object(o)
      end
    rescue Riak::FailedRequest => err
      raise unless err.not_found?
    end
def code_object(url)
      sha = url_key url
      if o = @url_bucket.get(sha, :r => 1)
        fix_url_object(o)
      end
    rescue Riak::FailedRequest => err
      raise unless err.not_found?
    end
Retrieves the code riak value for a given URL.

 url - The String URL to lookup.

 Returns a Riak::RObject, or nil if none is found.