destory item without user

gistfile1.txt

models = %w(Theme Entry Vote Activity Feed Follow Notification Authentication)
models.each do | model |
  model.constantize.all.each do | obj |
    if obj.user.nil?
      puts "User #{obj.user_id} doesn't exist. So destroy #{model} #{obj.id}"
      obj.destroy
    end
  end
end
Follow.all.each do | obj |
  if obj.user.nil?
    puts "Followed #{obj.followed_id} doesn't exist. So destroy Follow #{obj.id}"
    obj.destroy
  end
end