All the files

applicationhelper.rb

module ApplicationHelper
  def link_to_add_fields(name, f, association)
    new_object = f.object.send(association).klass.new
    id = new_object.object_id
    fields = f.fields_for(association, new_object, child_index: id) do |builder|
      render(association.to_s.singularize + "_fields", f: builder)
    end
    link_to(name, '#', class: "add_fields", data: {id: id, fields: fields.gsub("\n", "")})
  end
end

Error:

ActiveRecord::RecordNotFound in OrdersController#create

Couldn't find Product with ID=1 for Order with ID=

Rails.root: /BillingSystem
Application Trace | Framework Trace | Full Trace

app/controllers/orders_controller.rb:10:in `new'
app/controllers/orders_controller.rb:10:in `create'

Request

Parameters:

{"utf8"=>"✓",
 "authenticity_token"=>"jE2wdERoxE7PKwBhN60KAfguxwAq8qdW4wbru51SMFg=",
 "order"=>{"client_id"=>"1",
 "products_attributes"=>{"1368389171328"=>{"id"=>"1",
 "_destroy"=>"false"}}},
 "commit"=>"Create Order"}

Show session dump

Show env dump
Response

Headers:

None

gistfile1.txt

class Orderedproduct < ActiveRecord::Base
  attr_accessible :order_id, :product_id, :quantity_ordered
  belongs_to :order
  belongs_to :product
end

NewOrderView.rb

<% if current_user %>
	<div id="dashboard">
		<div id="logo"></div>
		<table id="go_back_link_container">
			<tr>
				<td>
					<div class="go_back_link">
						<%= link_to "<- Go Back", "/orders/view" %>
					</div>
				</td>
				<td>
					<div id="user_display">
						Logged in as <%= current_user.email %>.
						<%= link_to "Log out", log_out_path %>
					</div>
				</td>
			</tr>
		</table>
		<%= form_for @order, method: :post do |f| %>
			<% if @order.errors.any? %>
				<div class="error_messages">
					<% for message in @order.errors.full_messages %>
						* <%= message %> <br>
					<% end %>
				</div>
			<% end %>
			<p>
				<%= f.label 'Select The Client' %><br />
				<%= select :order, :client_id, Client.all().collect { |c| [ (c.firstname + " " + c.surname), c.id ] } %>
			</p>

			<%= f.fields_for :products do |pf| %>
				<% render 'product_fields', f: builder %>
			<% end %>
			<%= link_to_add_fields "Add Product", f, :products %>
			
		  	<p class="button"><%= f.submit %></p>
		<% end %>
		<% flash.each do |name, msg| %>
			<%= content_tag :div, "* " + msg, :id => "flash_#{name}" %><br />
		<% end %>
		<div id="copyright-notice"><div id="copyright_border">Copyright © Conner McCabe, all rights reserved.</div></div>
	</div>
<% else %>
	<script type="text/javascript">
		window.location="<%= root_url %>"
	</script>
<% end %>

OrderModel.rb

class Order < ActiveRecord::Base
	has_many :orderedproducts
	has_many :products, through: :orderedproducts
	has_one :client

	attr_accessible :client_id, :order_total, :delivery_date, :products, :products_attributes 

	accepts_nested_attributes_for :products, :allow_destroy => true

	before_save :generate_total

	def generate_total
		self.order_total = self.products.map(&:product_price).sum
	end
end

OrdersController.rb

class OrdersController < ApplicationController
	def view
		@orders = Order.all
	end

	def new
		@order = Order.new
		@suppliers = Supplier.all
	  	@products = Product.all
	end
	def create
	  	@order = Order.new(params[:order])
		if @order.save
			redirect_to '/orders/view', :notice => "Order Created!"
		else
			render "new"
		end
	end
end

ProductFields.rb

<fieldset>
  <%= f.select :id, Product.all().collect {|p| [ p.product_name, p.id ] } %>
  
  <%= f.hidden_field :_destroy %>
  <%= link_to "remove", '#', class: "remove_fields" %>
</fieldset>

ProductsModel.rb

class Product < ActiveRecord::Base
	#This line makes these elements accessible outside of the class.
	attr_accessible :product_name, :product_price, :product_quantity, :supplier_id

	has_many :orderedproducts
	has_many :orders, through: :orderedproducts
	belongs_to :supplier

	#These attributes ensure that the data entered for each element is valid and present.
	validates_presence_of :product_name
	validates_presence_of :product_price
	validates_numericality_of :product_price
	validates_presence_of :product_quantity
	validates_numericality_of :product_quantity
	validates_presence_of :supplier_id

end