_form.html.erb

<%= form_for(resource, :as => resource_name, :url => registration_path(resource_name), :html => {:class => "form"}) do |f| %>
        <% @user.domains.build %>
  <%= devise_error_messages! %>
  <%= f.email_field :email, :autofocus => true, :placeholder => "Email" %></br>
  <%= f.password_field :password, :placeholder => "Password" %>
  <%= f.password_field :password_confirmation, :placeholder => "Password again, please." %>


  <%= f.fields_for :domains do |domain_form| %>
   <%= domain_form.text_field :domain_name, :placeholder => "Domain Name" %>
   <%= domain_form.text_field :domain_price, :placeholder => "Price (USD)" %>
    <% end %>

  <div><%= f.submit "Sign up", :class => " span3 btn btn-block btn-large" %></div>
<% end %>

~             

domain.rb

class Domain < ActiveRecord::Base
require "addressable/uri"
@@heroku = Heroku::API.new(:username => USER, :password => PASS)

  belongs_to :user

  attr_accessible :name, :price, :user_id


  def add_user_domain(domain)
      www_domain = 'www.' + domain
       @@heroku.post_domain('namesushi', domain)
       @@heroku.post_domain('namesushi', www_domain)

  end


end
~                                                                                                                                          
~                                                                                                                                          
~                 

index.html.erb

                <%= render 'devise/registrations/form' %>

user.rb

class User < ActiveRecord::Base

  has_many :domains
  accepts_nested_attributes_for :domains


  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable,
  # :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :email, :password, :password_confirmation, :remember_me, :domains_attributes


end
~