Rails - Dec 2007 - Getting a 'State can't be blank' validation error on submit

See http://pastie.caboo.se/124961

I''m basically just trying to validate the Users.state_id field. The
Users table holds the FK to States as user.state_id, where there is a
one-to-many between States and Users.

# state.rb:
class State < ActiveRecord::Base
  has_many :users
end

# user.rb:
class User < ActiveRecord::Base
  ...
  belongs_to :state
  ...
  validates_presence_of     :state_id
  validates_associated      :state
  ...
end

# user_controller.rb:
class UserController < ApplicationController
  ...
  def signup
    ...
    @user = User.new(params[:user])
    return unless request.post?
    @user.save!
    self.current_user = @user
    redirect_back_or_default(:controller => ''/user'',
:action =>
''index'')
    flash[:notice] = "Thanks for signing up!"
  rescue ActiveRecord::RecordInvalid
    render :action => ''signup''
  end
end

signup.rhtml:
...
<%= error_messages_for :user %>
<% form_for :user, :url => {:action => "signup" } do |f|
-%>
  ...
  <%= f.collection_select :state_id, State.find_all, :id, :name,
{:include_blank => true}, {:style => ''background-color: rgb(255,
255,
160);'', :class => ''form-txt2''} %>
...

development.log:
...
Processing UserController#signup (for 127.0.0.1 at 2007-12-05
09:57:40) [POST]
  Session ID: 815f814a0b1d8cb815f0e047a920f142
  Parameters: {"user"=>{"city"=>"",
"born_on(1i)"=>"1907",
"postal_code"=>"",
"born_on(2i)"=>"12",
"looking_for_id"=>"1",
"headline"=>"",
"height_inches_id"=>"1",
"password_confirmation"=>"",
"country"=>"United States",
"have_children_id"=>"1",
"born_on(3i)"=>"5",
"smoke_id"=>"1",
"terms_of_service"=>"0",
"want_children_id"=>"1",
"ethnicity_id"=>"1",
"drink_id"=>"1",
"description"=>"",
"marital_status_id"=>"1",
"body_type_id"=>"1",
"interests_string"=>"",
"hair_color_id"=>"1", "login"=>"",
"password"=>"",
"religion_id"=>"1", "email"=>"",
"state"=>"18",
"profession"=>""},
"typed_code"=>"", "x"=>"30",
"y"=>"11",
"action"=>"signup",
"controller"=>"user",
"picture"=>"",
"preference"=>{"receive_jsh_mail"=>"1"}}
State Load (0.000000)  SELECT * FROM states
...
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