Remove duplicate tracks from iTunes.

remove_dup_tracks.rb

#!/usr/bin/env ruby
#
# Remove duplicate tracks from iTunes with
# (itunes-client)[https://github.com/katsuma/itunes-client/].
# ------------------------------------
#
require  "itunes-client"
include Itunes

begin
  tracks = Track.find_by(enabled: "true")
rescue JSON::ParserError => e
  puts e
  puts e.backtrace.join("\n")
end

# create map by name.
puts "Checking duplicate tracks..."
mapping = {}

tracks.each do |track|
  if mapping.key? "#{track.artist}_#{track.album}_#{track.name}"
    mapping["#{track.artist}_#{track.album}_#{track.name}"] << track
  else
    mapping["#{track.artist}_#{track.album}_#{track.name}"] = [track]
  end
end

puts "Deleting duplicate tracks..."
mapping.each do |_, val|
  if val.size > 1
    val.last.delete!
  end
end