foursuare_help_me.rb

require 'open-uri'
require 'pp'
require 'json'
require 'ostruct'

class FoursquareApiParser
  attr_accessor :response

  def initialize(url)
    @response = JSON.load(open(url))["response"]
  end

  def self.find(collection, node, attributes=[])
    collection[node].each do |n|
      pp make_object(attributes, n)
      FoursquareApiParser.find(n, node, attributes) if n[node] && n[node].size > 1
    end
  end

  def self.make_object(attributes, values)
    obj = OpenStruct.new
    attributes.each do |a|
      obj.send "#{a}=", values[a]
    end
    obj
  end
end

foursquare_api = FoursquareApiParser.new 'https://api.foursquare.com/v2/venues/categories?oauth_token=KLK3CSSK2NI5FZEEMK3RIOIEVI1UH4DOJ4OGTPTD0LZ3VVUZ&v=20140204'

FoursquareApiParser.find(foursquare_api.response, "categories", ["name", "id", "pluralName"])