Rails 3 Nested Forms - ruby-on-rails

Question

I have a Person model and an Address Model:
class Person < ActiveRecord::Base
has_one :address
accepts_nested_attributes_for :address
end
class Address < ActiveRecord::Base
belongs_to :person
end
In my people controller I have #person.build_address in my new action. My forms builds correctly. The problem is that when I submit the form, a person record and an address record is created but they aren't linked via the address_id column in the Person table.
Am I missing a step in the controller?
Thanks!
New Action
UPDATE
def new
#person = Person.new
#person.build_address
respond_to do |format|
format.html # new.html.erb
format.xml { render :xml => #person }
end
end
Form Code
UPDATE
<%= form_for(#person) do |f| %>
<% if #person.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#person.errors.count, "error") %> prohibited this person from being saved:</h2>
<ul>
<% #person.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :first_name %><br />
<%= f.text_field :first_name %>
</div>
<div class="field">
<%= f.label :last_name %><br />
<%= f.text_field :last_name %>
</div>
<div class="field">
<%= f.label :email %><br />
<%= f.text_field :email %>
</div>
<div class="field">
<%= f.label :telephone %><br />
<%= f.text_field :telephone %>
</div>
<div class="field">
<%= f.label :mobile_phone %><br />
<%= f.text_field :mobile_phone %>
</div>
<div class="field">
<%= f.label :date_of_birth %><br />
<%= f.date_select :date_of_birth %>
</div>
<div class="field">
<%= f.label :gender %><br />
<%= f.select(:gender, Person::GENDER_TYPES) %>
</div>
<div class="field">
<%= f.label :notes %><br />
<%= f.text_area :notes %>
</div>
<div class="field">
<%= f.label :person_type %><br />
<%= f.select(:person_type, Person::PERSON_TYPES) %>
</div>
<%= f.fields_for :address do |address_fields| %>
<div class="field">
<%= address_fields.label :street_1 %><br />
<%= address_fields.text_field :street_1 %>
</div>
<div class="field">
<%= address_fields.label :street_2 %><br />
<%= address_fields.text_field :street_2 %>
</div>
<div class="field">
<%= address_fields.label :city %><br />
<%= address_fields.text_field :city %>
</div>
<div class="field">
<%= address_fields.label :state %><br />
<%= address_fields.select(:state, Address::STATES) %>
</div>
<div class="field">
<%= address_fields.label :zip_code %><br />
<%= address_fields.text_field :zip_code %>
</div>
<% end %>
<div class="actions">
<%= f.submit %>
</div>
<% end %>

Answer 1

You need to have accepts_nested_attributes_for :address on your Person model for this to work nicely. In your create action you can then do this:
def create
#person = Person.new(params[:person])
...
end
Then Rails will take care of the rest.
UPDATE: if the address_id column is in the people table then it should be belongs_to :address, not has_one :address

Answer 2

Why is your address built in your new action, and not in the create action? You're building an address from a non saved model, without an id, so the foreign key can't be set. You should keep your #person in your new action, but put your build_address in your create action, after #person has been saved.