Datamapper DataMapper

The ActionView::Helpers::FormHelper#fields_for method in Rails 2.3 allows you to create forms with nested models. This does not work with DataMapper and the one-to-many association. It seems, that it always uses one-to-one associations. The example below illustrated the problem:

Models:

class Artist
  include DataMapper::Resource
  property :id, Serial

  has n, :profiles
end

class Profile
  include DataMapper::Resource
  property :id, Integer, :serial => true
  property :data, String
  property :adapter, String

  belongs_to :artist
end

View:

<% form.fields_for :profiles do |p| %>    
  <p><label for=""><%= p.object.adapter %></label>
    <%= p.text_field :data %>
  </p>
<% end %>

Generated field:

<input id="artist_profiles_data" name="artist[profiles][data]" size="30" type="text" />

Expected field:

<input id="artist_profiles_0_data" name="artist[profiles][0][data]" size="30" type="text" />