1 class ArtistBelongsToUserData < ActiveRecord::Migration
3 Artist.find_each do |artist|
5 artist.user_id = Author.find(artist.author_id).user_id
7 par = ProviderArtist.find_by_demanders_artist_id(artist.id)
8 artist.provider_id = par.provider_id
12 remove_column :artists, :author_id