Validations and Adding Products

new.html.erb

<%= form_tag create_multiple_products_path, :method => :post do %>

  <%= date_select("product", "purchase_date")  %> # This acts as a global field for all Products.

  <% @products.each_with_index do |product, index| %>
     <%= fields_for "products[#{index}]", product do |up| %>
        <%= render "fields", :f => up %>
     <% end %>
  <% end %>

  <%= submit_tag "Done" %>
<% end %>

products_controller.rb

class ProductsController < ApplicationController
  def new
    @products = Array.new(2) { Product.new }
  end

  def create_multiple
    Product.transaction do
      begin                               # use to be create! but that was without any validations.
        @products = current_user.products.create(params[:products].map { |_k, up| up.merge params[:product] })
        redirect_to :back, :notice => "Success!"
      rescue ActiveRecord::Rollback
        redirect_to :back, :notice => "An error occurred, please try again."
      end
    end
  end
end