helpers.rb

    # Converts a hash into a query string
    #
    # Hash keys can be underscored names 
    # @example
    #   { :service_type => 'rsemail' }
    #
    # Or the Rackspace API expected string 
    #
    # @param [Hash, #to_hash] hash to convert
    # @return [String] query param
    def query_string_from_hash( hash )
      hash.to_hash.collect do |k, v|
        key, *keys = k.to_s.split( '_' )
        key << keys.map( &:capitalize ).join( '' )

        "%s=%s" % [ key, URI.escape( v.to_s ) ]
      end.join( '&' )
    end