Registration form now remembers field values for nested form errors

app/models/user_profile.rb

@@ -1,5 +1,4 @@
 class UserProfile < ActiveRecord::Base
-  # Setup accessible (or protected) attributes for your model
   attr_accessible :user_id, :addrStreet1, :addrStreet2, :addrCity,
     :addrState, :addrZip, :phone
 
@@ -10,7 +9,7 @@ class UserProfile < ActiveRecord::Base
   #validates :addrCity , :presence => true
   #validates :addrState , :presence => true
   #validates :addrZip , :presence => true
-  validates :phone, :presence => true
+  #validates :phone, :presence => true
 
   def to_s
     [addrStreet1, addrStreet2, addrCity, addrState, addrZip, phone].join(" - ")

app/views/devise/registrations/new.html.haml

@@ -18,7 +18,8 @@
     %br/
     = f.email_field :email
   %div
-    = f.fields_for :user_profiles, UserProfile.new do |builder|
+    - profile_builder = resource.user_profiles.empty? ? resource.user_profiles.build : resource.user_profiles
+    = f.fields_for :user_profiles, profile_builder do |builder|
       = render 'user_profile_fields', f: builder
   %div
     = f.label :password