yahoo yql with ruby and oatuh

yql_ruby_oauth.rb

require 'oauth'
require 'json'


module Yahoo
  CONSUMER_KEY    = "...."
  CONSUMER_SECRET = "...."

  class GeoLoc
    def initialize(consumer_key = CONSUMER_KEY, consumer_secret = CONSUMER_SECRET)
      @consumer_key    = consumer_key
      @consumer_secret = consumer_secret
      access_token
    end

    def access_token
      @access_token ||= OAuth::AccessToken.new(OAuth::Consumer.new(@consumer_key, @consumer_secret, :site => "http://query.yahooapis.com"))
    end

    def escape string
      OAuth::Helper.escape(string)
    end

    def make_query_url url
      "/v1/yql?q=#{OAuth::Helper.escape(url)}&format=json"
    end

    def query_api url
      JSON.parse access_token.request(:get, make_query_url(url)).body
    end

    def find_by_address string
      address_url = "SELECT centroid from geo.places WHERE text='#{string}'"
      Location.new query_api(address_url)
    end

    def find sql
      query_api(sql)
    end
  end

  class Location
    def initialize(response)
      @response = response
    end

    def latitude
      if results =  @response["query"]["results"]
        results["place"].is_a?(Array) ? results["place"].last["centroid"]["latitude"] : results["place"]["centroid"]["latitude"]
      else
        nil
      end
    end

    def longitude
      if results =  @response["query"]["results"]
        results["place"].is_a?(Array) ? results["place"].last["centroid"]["longitude"] : results["place"]["centroid"]["longitude"]
      else
        nil
      end
    end

    def coords
      (latitude && longitude) ? "#{latitude}, #{longitude}" : nil
    end
  end
end


client = Yahoo::GeoLoc.new.find_by_address("9 de julio 900, tucuman, san miguel de tucuman").coords #-26.826031, -65.232841