Can't Mass assign attributes with nested form - ruby-on-rails

Question

I have 2 forms, a orders form and a products form. I would like the products form to be under the orders form. I am getting this error: Can't mass-assign protected attributes: products_attributes.
Here is my orders model
class Order < ActiveRecord::Base
attr_accessible :comments, :due_date, :order_type, :print_color, :print_location, :title,
:products
validates :order_type, :due_date, :print_color, :title, :presence => true
validates :title, :uniqueness => true
has_many :products
accepts_nested_attributes_for :products, :allow_destroy => true
end
products model
class Product < ActiveRecord::Base
attr_accessible :quantity
has_one :order
end
orders controller:
>class OrdersController < ApplicationController
# GET /orders
# GET /orders.json
def index
#orders = Order.all
respond_to do |format|
format.html # index.html.erb
format.json { render json: #orders }
end
end
# GET /orders/1
# GET /orders/1.json
def show
#order = Order.find(params[:id])
#products = #order.products.find(:all)
respond_to do |format|
format.html # show.html.erb
format.json { render json: #order }
end
end
# GET /orders/new
# GET /orders/new.json
def new
#order = Order.new
respond_to do |format|
format.html # new.html.erb
format.json { render json: #order }
end
end
# GET /orders/1/edit
def edit
#order = Order.find(params[:id])
end
# POST /orders
# POST /orders.json
def create
#order = Order.new(params[:order])
respond_to do |format|
if #order.save
format.html { redirect_to #order, notice: 'Order was successfully created.' }
format.json { render json: #order, status: :created, location: #order }
else
format.html { render action: "new" }
format.json { render json: #order.errors, status: :unprocessable_entity }
end
end
end
# PUT /orders/1
# PUT /orders/1.json
def update
#order = Order.find(params[:id])
respond_to do |format|
if #order.update_attributes(params[:order])
format.html { redirect_to #order, notice: 'Order was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: "edit" }
format.json { render json: #order.errors, status: :unprocessable_entity }
end
end
end
# DELETE /orders/1
# DELETE /orders/1.json
def destroy
#order = Order.find(params[:id])
#order.destroy
respond_to do |format|
format.html { redirect_to orders_url }
format.json { head :no_content }
end
end
end
any help would be appreciated! thanks in advance.

Answer 1

Replace:
attr_accessible ..., :products
With:
attr_accessible ..., :products_attributes