Serialize

serialize.rb

RSpec.configure do |config|
  # Use color in STDOUT
  config.color_enabled = true
 
  # Use color not only in STDOUT but also in pagers and files
  config.tty = true
 
  # Use the specified formatter
  config.formatter = :progress # :progress, :html, :textmate
end
 
#implement a song class and artist class to pass the specs below.
#serialize method should replace spaces in the song title with underscores
#and write to the current working directory
 
class Song

  attr_accessor :title, :artist
  
  def initialize(title=nil)
    @title = title
  end

  def serialize
    file_name = title.downcase.gsub(" ","_") << ".txt"
    file_text = "#{artist.name} - #{title}"
    File.open(file_name,"w") { |file| file.write(file_text) }
  end

  def self.deserialize(file_name)
    File.open(file_name,"r") do |text|
      line = IO.readlines(text).first
      artist_name, song_title = line.split(" - ")
      Song.new(song_title).tap do |song|
        song.artist = Artist.new(artist_name)
      end
    end
  end

end

class Artist

  attr_reader :name

  def initialize(name)
    @name = name
  end
  
end
 
describe Song do
  it "has a title" do
    song = Song.new
    song.title = "Night Moves"
    song.title.should eq("Night Moves")
  end
 
  it "has an artist" do
    song = Song.new
    song.title = "Night Moves"
    song.artist = Artist.new("Bob Seger")
    song.artist.name.should eq("Bob Seger")
  end
 
  it "can save a representation of itself to a file" do
    song = Song.new
    song.title = "Night Moves"
    song.artist = Artist.new("Bob Seger")
    song.serialize
    File.read("night_moves.txt").should match /Bob Seger - Night Moves/
  end
 
  it "can instantiate a song from a serialized file" do
    file = File.open("spottie_ottie.txt","w") { |f| f.write("Outkast - Spottie Ottie")}
    song = Song.deserialize("spottie_ottie.txt")
  end

  it "instantiates song with correct attributes from serialized file" do
    file = File.open("spottie_ottie.txt","w") { |f| f.write("Outkast - Spottie Ottie")}
    song = Song.deserialize("spottie_ottie.txt")
    song.title.should eq("Spottie Ottie")
    song.artist.name.should eq("Outkast")
  end

end