ruby on rails - how to leave the field filled with fields_for? -

i have problem : when customer enters shipping , billing informations in form, fields of address model lose information if page reloaded. works other fields, email, included directly in order model. how leave fields filled after reloading ?

here's new.html.erb file :

<%= form_for @order |f| %>   <ul>    <% @order.errors.each_with_index |msg, i| %>     <li><%= msg[1] %></li>    <% end %>   </ul>  <%= f.text_field :email, placeholder: "email" %>  <%= f.fields_for :shipping_address_attributes |sa| %>    <%= sa.text_field :first_name, placeholder: "firstname" %>     <%= sa.text_field :last_name, placeholder: "name", autocomplete: true %>   <%= sa.text_field :address1, placeholder: "address", autocomplete: true %>   #etc.  <% end %>  <p><%= f.submit 'next step' %></p> <% end %> 

my models :

class order < activerecord::base  belongs_to :billing_address, :class_name => "address"  belongs_to :shipping_address, :class_name => "address"  accepts_nested_attributes_for :shipping_address  accepts_nested_attributes_for :billing_address, reject_if: :bill_to_shipping_address      class address < activerecord::base   belongs_to :user   has_many :billing_addresses, :class_name => "order", :foreign_key => "billing_address_id", dependent: :nullify   has_many :shipping_addresses, :class_name => "order", :foreign_key => "shipping_address_id", dependent: :nullify   validates_presence_of :first_name, :last_name, :address1, :city, :country, :phone, :postal 

and order_controller.rb:

def new  @user = current_user  @order_items = current_order.order_items  @order = current_order  @amount = @order.subtotal end  def update @order_items = current_order.order_items @order = current_order   if @order.update(order_params)     redirect_to recapitulatif_de_la_commande_path   else     redirect_to(:back)   end end 

edit

maybe error due fact order not linked shipping address before update action ? works if address model validate presence of each attributes.

any idea ?