importer.rb

require 'nokogiri'
require 'open-uri'

class Importer

  def self.get_film_links
    doc = Nokogiri::XML(open('http://jagmit.co.uk/ruby/all-performances.xml'))
    doc.xpath('//cinema').each do |cinema_data|
      import_cinema(cinema_data)
    end
  end

  private

  def self.import_cinema(cinema_data)
    # find cinema
    cinema = Cinema.find_or_create_by_name(cinema_data[:name])
    cinema.update_attributes(:external_id => cinema_data[:id],
                             :url => cinema_data[:address],
                             :postcode => cinema_data[:postcode],
                             :telephone => cinema_data[:phone])

    # add films
    cinema_data.children.first.children.each do |film_data|
      import_film(cinema, film_data)
    end
  end

  def self.import_location(cinema_data)
    location = Location.find_or_create_by_title(cinema_data[:name])
    cinema_url = cinema_data[:url] + cinema_data[:postcode]
    update_attribute(:adressing, cinema_url)
  end



  def self.import_film(cinema, film_data)
    puts "#{film_data.inspect}"

    film = Film.find_or_create_by_title(film_data[:title])
    film.update_attributes(:rating => film_data[:rating],
                           :release => film_data[:release],
                           :length => film_data[:length],
                           :poster => film_data[:poster],
                           :director => film_data[:director],
                           :synopsis => film_data[:synopsis],
                           :cast => film_data[:cast])

    # add shows
    film_data.children.first.children.each do |show_data|
      import_screening(cinema, film, show_data)
    end
  end

  def self.import_screening(cinema, film, show_data)
    screening = Screening.find_by_cinema_id_and_film_id(cinema.id, film.id)
    screening ||= Screening.create(:cinema => cinema, :film => film)
    screening.shows.create(:day => show_data[:date],
                           :showed_at => show_data[:time],
                           :video_type => show_data[:videoType])
  end

end

Not working

  def self.import_location(cinema_data)
    location = Location.find_or_create_by_title(cinema_data[:name])
    cinema_url = cinema_data[:url] + cinema_data[:postcode]
    update_attribute(:adressing, cinema_url)
  end

schema.rb

# encoding: UTF-8
# This file is auto-generated from the current state of the database. Instead
# of editing this file, please use the migrations feature of Active Record to
# incrementally modify your database, and then regenerate this schema definition.
#
# Note that this schema.rb definition is the authoritative source for your
# database schema. If you need to create the application database on another
# system, you should be using db:schema:load, not running all the migrations
# from scratch. The latter is a flawed and unsustainable approach (the more migrations
# you'll amass, the slower it'll run and the greater likelihood for issues).
#
# It's strongly recommended to check this file into your version control system.

ActiveRecord::Schema.define(:version => 20120325212946) do

  create_table "cinemas", :force => true do |t|
    t.string   "name"
    t.string   "url"
    t.string   "postcode"
    t.string   "telephone"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.integer  "external_id"
  end

  create_table "films", :force => true do |t|
    t.string   "title"
    t.string   "rating"
    t.string   "release"
    t.string   "length"
    t.string   "poster"
    t.string   "director"
    t.string   "synopsis"
    t.string   "cast"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

  create_table "locations", :force => true do |t|
    t.string   "addressing"
    t.float    "latitude"
    t.float    "longitude"
    t.integer  "cinema_id"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

  create_table "screenings", :force => true do |t|
    t.integer "cinema_id"
    t.integer "film_id"
  end

  create_table "shows", :force => true do |t|
    t.string   "day"
    t.string   "showed_at"
    t.string   "video_type"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.integer  "screening_id"
  end

end