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: 20190605122226_move_playlist_description_to_credits.rb
    path of file: ./repos/alonetone/db/migrate
    
    the code of the file until where you have to start completion: class MovePlaylistDescriptionToCredits < ActiveRecord::Migration[6.0]
  def change
    # Only playl
    
  def change
    # Only playlist.credits shows in White Theme
    Playlist.find_each do |playlist|
      if playlist.description.present?
        if playlist.credits.present?
          playlist.update_column :credits, "#{playlist.description}\n#{playlist.credits}"
        else
          playlist.update_column :credits, playlist.description
        end
      end