beathaven/app/models/artist.rb

class Artist < ActiveRecord::Base
  has_many :albums
  has_many :performers
  has_many :tracks, through: :performers
  has_many :artist_genres
  has_many :genres, through: :artist_genres

  attr_accessible :bio, :is_group, :name, :pic, :rovi_id, :albums, :genres

  scope :discography, lambda {
    includes(:albums).includes(:tracks)
  }

  def loaded?
    pic? && bio?
  end

  def url
    "/artist/#{name.gsub(/\s/, "+")}" rescue ""
  end

  def import
    return unless rovi_id?

    robbie_artist = Robbie::Artist.find(rovi_id)
    return if robbie_artist.nil?

    update_attributes(
      name: robbie_artist.name,
      is_group: robbie_artist.is_group,
      pic: nil,
      bio: nil,
      albums: robbie_artist.albums.map{ |robbie_album|
        Album.find_or_create_by_rovi_id(robbie_album.id).import
      },
      genres: robbie_artist.genres.map{ |robbie_genre|
        genre = Genre.find_or_create_by_rovi_id(robbie_genre.id)
        genre.update_attributes(
          name: robbie_genre.name
        )
        genre
      }
    )

    self
  end

  class << self
    def with_name(name)
      # DB lookup
      artist = where(name: name).discography.first
      return artist unless artist.nil?

      # Rovi correction
      rovi_artist = Robbie::Artist.find_by_name(name)
      return artist if rovi_artist && artist = find_by_rovi_id(rovi_artist.id)

      # Parsing artist if ok
      Artist.create(rovi_id: robbie_artist.id).import
    end
  end
end