Seed script will read through db/seed/songs and create a favorite mix…

…tape with all valid songs. Songs are validated by presence and content type of audio

.gitignore

@@ -3,4 +3,5 @@ db/*.sqlite3
 log/*.log
 tmp/
 .sass-cache/
-public/system
+public/system
+db/seed

Gemfile

@@ -17,6 +17,10 @@ group :assets do
 end
 
 gem 'paperclip'
+
+gem 'ruby-mp3info', :require => 'mp3info'
+# gem 'taglib-ruby', :require => 'taglib'
+
 gem 'jquery-rails'
 
 group :development, :test do

Gemfile.lock

@@ -113,6 +113,7 @@ GEM
       columnize (>= 0.3.1)
       linecache19 (>= 0.5.11)
       ruby-debug-base19 (>= 0.11.19)
+    ruby-mp3info (0.6.16)
     ruby_core_source (0.1.5)
       archive-tar-minitar (>= 0.5.2)
     sass (3.1.10)
@@ -147,6 +148,7 @@ DEPENDENCIES
   rails (= 3.1.1)
   rspec-rails
   ruby-debug19
+  ruby-mp3info
   sass-rails (~> 3.1.4)
   sqlite3
   uglifier (>= 1.0.3)

app/models/song.rb

@@ -5,6 +5,11 @@ class Song < ActiveRecord::Base
 
   has_attached_file :audio
 
+  # http://rubydoc.info/github/thoughtbot/paperclip/master/Paperclip/ClassMethods:validates_attachment_content_type
+  # https://netfiles.uiuc.edu/xythoswfs/static/en/content_type.htm
+  validates_attachment_presence :audio
+  validates_attachment_content_type :audio, :content_type => /^audio/
+
   def artist_name
     self.artist.name if self.artist.present?
   end

db/seeds.rb

@@ -5,3 +5,58 @@
 #
 #   cities = City.create([{ name: 'Chicago' }, { name: 'Copenhagen' }])
 #   Mayor.create(name: 'Emanuel', city: cities.first)
+
+# Create a mixtape
+# Loop through the contents of a directory
+  # for each file, check if it's an mp3
+  # if it's an mp3 file, create a song
+   # parse the file for an artist name
+   # read the file data
+   # create a song with the file data and the artist
+# Add all the songs to the mixtape
+ # require "mp3info"
+
+@mixtape = Mixtape.new(:name => "My Favorite Songs")
+puts "Initialized Mixtape - #{@mixtape.name}..."
+
+@songs = []
+
+# File API - http://www.ruby-doc.org/core-1.9.2/File.html
+# Dir API - http://www.ruby-doc.org/core-1.9.2/Dir.html
+# Dir.entries vs Dir.foreach
+
+# Dir.entries("#{Rails.root}/db/seed/songs").each do |file
+
+puts "Opening #{Rails.root}/db/seed/songs..."
+
+Dir.foreach("#{Rails.root}/db/seed/songs") do |file_name|
+  next if file_name == "." || file_name == ".."
+  puts "...processing #{file_name}"
+
+  # How to check if it's an MP3
+
+  # if file_name.split(".").last != "mp3"
+  #   puts "......skipping #{file_name} because it isn't an mp3" 
+  #   next
+  # end
+
+  file = File.new("#{Rails.root}/db/seed/songs/#{file_name}", 'r')
+
+  if File.extname(file.path) != ".mp3"
+    puts "......skipping #{file_name} because it isn't an mp3" 
+    next
+  end
+
+  # https://www.ruby-toolbox.com/gems/ruby-mp3info
+  # https://github.com/moumar/ruby-mp3info
+  # http://rubydoc.info/gems/ruby-mp3info/frames
+
+  mp3 = Mp3Info.open(file.path)
+
+  song = Song.new :name => mp3.tag.title, :artist_name => mp3.tag.artist, :audio => file
+
+  @songs << song if song.save
+end
+
+@mixtape.songs << @songs
+@mixtape.save