You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: artist.rb
    path of file: ./repos/chordbook/app/models
    
    the code of the file until where you have to start completion: class Artist < ApplicationRecord
  include AlphaPaginate
  include Metadata
  include PgSearch::Model
  include Viewable

  has_paper_trail

  has_many :albums, dependent: :destroy
  has_many :tracks, dependent: :destroy
  has_many :artist_works, dependent: :destroy
  has_many :songsheets, through: :artist_works, source: :work, source_type: "Songsheet"
  belongs_to :genre, optional: true
  has_many :library_items, as: :item, dependent: :destroy

  before_validation :associate_genre

  searchkick word_start: [:title], stem: false, callbacks: :async
  scope :order_by_alphabetical, -> { order("UPPER(artists.name)") }
  scope :order_by_popular, -> { order("artists.rank") }
  scope :search_import, -> { includes(:image_attachment) }
  scope :with_attachments, -> { includes(image_attachment: {blob: :variant_records}) }

  attach_from_metadata image: %w[strArtistThumbHQ strArtistThumb] do |attachable|
    options = {
      format: :jpeg,
      saver: {subsample_mode: "on", strip: true, i
    
  def self.lookup_all(names)
    unknown = []
    artists = []

    Array(names).each do |name|
      artist = Artist.lookup(name.gsub(/^by /, ""))

      # Artist found, nothing else to do
      artists << artist && next if artist

      # No artist by that name. Is it multiple artists?
      split_names = name.split(/,?\s+and\s+|,|&/i).map(&:strip)

      if split_names.length > 1
        # Recursive lookup on each name
        now_found, still_unknown = lookup_all(split_names)

        # Add original name if any are still unknown
        unknown << name if still_unknown.length > 0

        # Save the results
        unknown += still_unknown
        artists += now_found
      else
        unknown << name
      end
    end.flatten.compact

    [artists.uniq, unknown]
  end

  def search_data
    {
      type: self.class,
      title: name,
      attachment_id: image_attachment&.id,
      everything: [name, metadata["strArtistAlternate"].presence].compact,
      boost: 2.0
    }
  end

  def associate_genre
    return if metadata["strGenre"].blank?
    self.genre ||= Genre.find_or_create_by!(name: metadata["strGenre"])
  end
end