module Addressable
  class URI
    alias :orig_query_values= :query_values=

    def query_values=(params)
      keys.each do |key|
        self[key.to_s] = delete(key).to_json if %(key startkey endkey).include?(key.to_s)
      end
      self.orig_query_values = params
    end
  end
end

class String
  def to_uri(params={})
    Addressable::URI.parse(self).tap do |uri|
      uri.query_values = params
    end
  end
end