count_facebook.rb

require 'koala'
require 'httpclient'
require 'json'


class Event
  def initialize params
    @id = params[:id]
    @graph = Koala::Facebook::API.new('CAACEdEose0cBANQRADTYIXfbGoQaL7Fv0dheFWAxBsiemgghsACX7qkfVnvRLNGwrF0NTNxUPZBrxGXtgVZCF67yEGPiwZCgIL4cWNEY9o5Itr8cIzqTbOnyM7pBUwiFzUj5Iq62ImXPVRZAEgXo39Rvy2U4JUA3q7RNofm6DRIo9QDmJ1eFc0JqnoV2YYmN9ZBjU26ruXrBUqi9EAkoH')
  end

  def people_going
    attending.map {|attend| attend["name"].split.first }
  end

  def total_attending
    people_going.size
  end

  private

  def attending
    @graph.get_object("#{@id}/attending")
  end
end

class Genderize
  def initialize params
    @people_going = params[:people_going]
    @http_client = params[:http_client] || HTTPClient.new
  end

  def genders
    @genders ||= JSON.parse(@http_client.get("http://api.genderize.io?#{query}&country_id=br").content)
  end

  private

  def query
    i = 0
    query = []

    @people_going.each do |name|
      query << "name[#{i}]=#{name.downcase}"
      i = i + 1
    end

    query.join("&")
  end
end

class GenderCount
  def initialize params
    @genderize = params[:genderize]
  end

  def female_count
    count_by_gender "female"
  end

  def male_count
    count_by_gender "male"
  end

  def gender_ratio
    female_count.to_f/male_count
  end

  private

  def count_by_gender gender
    @genderize.genders.select {|person| person["gender"] == gender}.count
  end
end

event = Event.new(:id => "635989689843436")
genderize = Genderize.new(:people_going => event.people_going)
gender_count = GenderCount.new(:genderize => genderize)

puts "female: #{gender_count.female_count.to_s}"
puts "male: #{gender_count.male_count.to_s}"
puts "ratio: #{gender_count.gender_ratio}"
puts "total: #{event.total_attending.to_s}"