How to create Rails3 forms for embedded Mongoid models?

How to create form for new User model wi开发者_运维知识库th embedded Phone model? I've found solution for creating form to add Phone for existing User but how to do that at the same time i create new User?

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You have to create a nested form

<%= form_for @user, :url => users_path do |f| %>

  <%= f.label :name, "Name:" %> <br />
  <%= f.text_field :name %>

  <%= f.fields_for :phone do |p| %>        
    <%= p.label :number, "Phone Number" %> <br />
    <%= p.text_field :number %>
  <% end %>

<% end %>