```ruby
class PopulateAlephIdFromUserAttributes < ActiveRecord::Migration
  def up
    say_with_time "Migrating Aleph ID." do
      User.all.each do |user|
        user.update_attribute :aleph_id, YAML.load(user.user_attributes)[:nyuidn]
      end
    end
  end

  def down
  end
end
```

Migrate aleph id into user using a hash, not string
user
```ruby
class PopulateAlephIdFromUserAttributes < ActiveRecord::Migration
  def up
    say_with_time "Migrating Aleph ID." do
      User.all.each do |user|
        user.update_attribute :aleph_id, user.user_attributes[:nyuidn]
      end
    end
  end

  def down
  end
end
```
assistant