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: playlist.rb
    path of file: ./repos/black_candy/app/models
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

class Playlist < ApplicationRecord
  include SearchableConcern
  include SortableConcern

  validates :name, presence: true, if: :require_name?

  has_many :playlists_songs
  has_many :songs, -> {
    
  def replace(song_ids)
    songs.clear

    PlaylistsSong.acts_as_list_no_update do
      playlist_songs = song_ids.map.with_index do |song_id, index|
        {song_id: song_id, playlist_id: id, position: index + 1}
      end

      PlaylistsSong.insert_all(playlist_songs)
    end
  end