application.rb

require 'rubygems'
require 'sinatra/base'
require 'person'
require 'csv'
require 'pp'

class Application < Sinatra::Base
  def self.empty_arrays
    set :people, []
    set :pups, []
    set :scis, []
    set :tpups, []
    set :tscis, []
    set :both, []
    set :extrap, []
  end

  configure do
    self.empty_arrays
  end

  get '/fun' do
    self.class.empty_arrays
    file = File.open("finreg.csv", "r")
    file.each_line do |line|
      fields = line.split(',')
      p = Person.new
      p.surname = fields[0].strip
      p.forename = fields[1].strip
      p.age = fields[2].strip
      p.choice = fields[3].strip
      
      if p.choice == "1"
         settings.pups.push(p)
      end
                
      if p.choice == "2"
         settings.scis.push(p)
      end
      
      if p.choice =="1" or p.choice == "3"
         settings.tpups.push(p)
      end
                
      if p.choice =="2" or p.choice == "3"
         settings.tscis.push(p)
      end
                
      if p.choice == "3"
         settings.both.push(p)
      end 
                
      settings.people.push(p)
    end

    output = settings.people.map { |p| "#{p.forename} #{p.surname} (#{p.age.to_s})" }
    output.join('<br />')
  end
  
  get '/fun/pups' do
    settings.pups.map { |p| p.printChoice }
  end

  get '/fun/all_p' do
    settings.tpups.map { |p| p.printChoice }
  end

  get '/fun/sci' do
    settings.scis.map { |p| p.printChoice }
  end

  get '/fun/all_s' do
    settings.tscis.map { |p| p.printChoice }
  end

  get '/fun/both' do
    settings.both.map { |p| p.printChoice }
  end
end

config.ru

$LOAD_PATH.unshift(File.dirname(__FILE__))
require 'application'

run Application

person.rb

class Person < Struct.new(:surname, :forename, :age, :choice)
  def title
    "<h1>Total Puppets</h1>"
  end
  
  def printName
    "#{surname}, #{forename}<br />"
  end
  
  def printChoice
    "#{forename} #{surname} (#{age})<br />"
  end
  
  def to_s
    "#{self.forename} #{self.surname} #{self.age} #{self.choice} <br />"
  end
end