count_facebook.rb

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


class Event
  def initialize params
    @id = params[:id]
    @graph = Koala::Facebook::API.new('CAACEdEose0cBACFZAz8GA45hmXCy6s0spYUbMCHsfZAcoe6UANu5ZAYJmr7DzNZCLO8aL8rZB6gjbNRzvFg5oD9PIsjVjKK3IXDmRcaesgOm0GSqGtye87pC6fjPz7WseSgI4VU8Sids7IwQrUphHkGbZAvAPj7wO5IEOeKbyv03giFvAKYJWrvonwJOCB9WMzNW1EFVQGGEPfhEFeuuS9')
  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
    @queries = mount_queries
  end

  def genders
    @genders ||= mount_genders
  end

  private

  def mount_genders
    group_genders = []

    @queries.each_slice(200).to_a.each do |query|
      group_genders << JSON.parse(@http_client.get("http://api.genderize.io?#{query.join("&")}").content)
    end

    group_genders.flatten
  end

  def mount_queries
    i = 0
    queries = []

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

    queries
  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 => "773544329347897")
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}"