Rails - Aug 2011 - Trying to use radio_button with a (possibly new) collection

I am trying to do a list of people in a collection that is shown with
a partial. This part works fine. The trouble comes when I put radio
buttons with each record for which family member gets the mail sent to
that house. If the record for a person is new, the radio button
returns ID instead of the id number that doesn''t exist yet. How can I
get the id of the record after it is saved and put it in
household.hoh ? Here is part of the app. By the way, I''m still using
2.3.9 until these problems are gone.

Thanks
Bob

_people.html.erb
<%= link_to_function "Add a Person" do |page|
		page.insert_html :after, "new", :partial => ''shared/
new_person'', :object => Person.new
end %>
<table width=60%>
	<th width=5%><b>HOH</b></th>
	<th width=20%><b>Last Name</b></th>
	<th width=30%><b>First Name</b></th>
	<th width=30%><b>M</b></th>
	<th width=30%><b>Sex</b></th>
	<th width=30%><b>Month</b></th>
	<th width=30%><b>Day</b></th>
	<th width=30%><b>Year</b></th>
<%= render :partial => ''shared/person'', :locals =>
{:household =>
@household} , :collection => @household.people.sort_by(&:birthday) %>
</div>
<div id="new">

</div>
</table>

_person.html.erb
<% fields_for "household[people_attributes][]", person do |
person_form| %>
<div><tr>
<td width=100><%= radio_button "household", "hoh",
:id, :class =>
''hoh''  %></td>
<td><%= person_form.text_field :last_name, :style =>
''text-align:
left'', :class => ''last_name'', :size => 25,
:maxlength => 25, :index =>
nil, :autocomplete => "off"  %></td>
<td><%= person_form.text_field :first_name, :style =>
''text-align:
left'', :class => ''first_name'', :size => 25,
:maxlength =>25, :index =>
nil, :autocomplete => "off"  %></td>
<td><%= person_form.text_field :middle, :style =>
''text-align:
right'', :class => ''middle'', :size => 1,
:maxlength =>1, :index =>
nil, :autocomplete => "off"  %></td>
<td><%= person_form.text_field :sex, :style => ''text-align:
right'', :size => 1, :maxlength =>1, :index => nil,
:autocomplete =>
"off"  %></td>
<td><%= person_form.text_field :month_, :style =>
''text-align:
right'', :size => 2, :maxlength =>2, :index => nil,
:autocomplete =>
"off" %></td>
<td><%= person_form.text_field :day_, :style =>
''text-align:
right'', :size => 2, :maxlength =>2, :index => nil,
:autocomplete =>
"off" %></td>
<td><%= person_form.text_field :year_, :style =>
''text-align:
right'', :size => 4, :maxlength =>4, :index => nil,
:autocomplete =>
"off" %></td>
<td><% if person_form.object.new_record? %>
	<%= link_to_function "Delete", "delete_row()" %>
<% else %>
	<%= person_form.hidden_field :id, :index => nil %>
	<%= link_to ''Delete'', person_path(person.id),  :confirm
=> ''Are you
sure?'', :method => :delete %>
<% end %>

household.rb
  def after_save
    person = Person.find(self.hoh)         # Of course, this is 0 at
the moment. I did after_save so the
|                                                          person
record would be there to access, I just need the id of it now,
    self.first_name = person.first_name
    self.last_name = person.last_name
    self.middle = person.middle
  end

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