class Object

def to_query(key)

using the given key as the param name.
Converts an object into a string suitable for use as a URL query string, 
def to_query(key)
  require 'cgi' unless defined?(CGI) && defined?(CGI::escape)
  "#{CGI.escape(key.to_param)}=#{CGI.escape(to_param.to_s)}"
end