Use render instead of redirect if registration/create fails

app/models/person.rb

@@ -4,6 +4,7 @@ class Person < ActiveRecord::Base
 
   attr_accessible :email, :first_name, :last_name, :public_name, :biography, :company, :avatar, :irc_nickname
 
+  belongs_to :user, :inverse_of => :person
   has_many :event_people, :dependent => :destroy
   has_many :events, :through => :event_people, :uniq => true
   has_many :registrations, :dependent => :destroy

app/models/supporter_registration.rb

@@ -1,7 +1,13 @@
 class SupporterRegistration < ActiveRecord::Base
   belongs_to :supporter_level
   belongs_to :registration
+  before_save :set_attributes_from_person
 
   attr_accessible :registration, :supporter_level_id, :name, :email, :supporter_level, :code, :code_is_valid, :conference_id
 
+  def set_attributes_from_person
+    self.name ||= registration.try(:person).try(:public_name)
+    self.email ||= registration.try(:person).try(:email)
+    true
+  end
 end

app/models/user.rb

@@ -8,7 +8,7 @@ class User < ActiveRecord::Base
          :confirmable
 
   has_and_belongs_to_many :roles
-  has_one :person
+  has_one :person, :inverse_of => :user
 
   attr_accessible :email, :password, :password_confirmation, :remember_me, :role_id, :role_ids, :person_attributes
   accepts_nested_attributes_for :person
@@ -50,7 +50,7 @@ class User < ActiveRecord::Base
   private
     def create_person
       # TODO Search people for existing email address, add to their account
-      build_person(:email => self.email)
+      build_person(:email => self.email) if person.nil?
       true
     end
 end