oldhaven/app/controllers/playlist_controller.rb

class PlaylistController < ApplicationController
  def data
    @playlist = Playlist.find_by_id(params[:id])
    render json: @playlist, include: { playlist_items: { include: { track: { include: { artists: {} }}}}}
  end
  
  def lastfm_top50
    artist = Artist.find_by_name(get_artist_name_from_query)
    return if artist.nil?
    
    playlist = Playlist.new(name: "#{artist.name}: Last.fm TOP 50", artist: artist, pic_url: artist.pic_url)
    LastFM::Artist.get_top_tracks(artist: artist.name)["toptracks"]["track"].each do |track|
      tracks = Track.joins(:album, :artists).where(name: track["name"], "track_artists.artist_id" => artist.id)
      playlist.playlist_items << PlaylistItem.new(track_id: tracks.first.id) unless tracks.empty?
    end
    
    cache_for 1.week
    compile_page(
      data: playlist.serialize,
      partial: "playlist/tracks",
      title: playlist.name,
      callback: {object: :player, action: :updateLibrary}
    )
  end
end