exception

Routing Error

No route matches {:controller=>"orderitems"}

Try running rake routes for more information on available routes. 

iwant

<%= link_to "Add to order", create_orderitem_path(@order, product) %>

-> @order already exists, product also they have to be merged now into the join table.
-> What is te proper path to use? order_orderitems_path(@currentOrder, product- doesn't work --> POST method not set

--> How to set the post-method with that specific path?

order.rb

class Order < ActiveRecord::Base
  ## ASSOCIATIONS
  has_many :orderitems
  has_many :products, :through => :orderitems
  belongs_to :customer
end

orderitem.rb

class Orderitem < ActiveRecord::Base
  ## ASSOCIATIONS
  belongs_to :product # product (id)
  belongs_to :order #order (id)
end

orderitems_controller.rb

class OrderitemsController < ApplicationController
  def index

	end

	def create
		
	end	
end

product.rb

class Product < ActiveRecord::Base
  #ASSOCIATIONS
  has_many :orderitems
  has_many :orders, :through => :orderitems
end

routes

order_orderitems GET    /orders/:order_id/orderitems(.:format)
                         orderitems#index
                             POST   /orders/:order_id/orderitems(.:format)
                         orderitems#create
         new_order_orderitem GET    /orders/:order_id/orderitems/new(.:format)
                         orderitems#new
        edit_order_orderitem GET    /orders/:order_id/orderitems/:id/edit(.:form
at)                      orderitems#edit
             order_orderitem GET    /orders/:order_id/orderitems/:id(.:format)
                         orderitems#show
                             PUT    /orders/:order_id/orderitems/:id(.:format)
                         orderitems#update
                             DELETE /orders/:order_id/orderitems/:id(.:format)
                         orderitems#destroy
                             GET    /orders(.:format)
                         orders#index
                             POST   /orders(.:format)
                         orders#create
                   new_order GET    /orders/new(.:format)
                         orders#new
                  edit_order GET    /orders/:id/edit(.:format)
                         orders#edit
                       order GET    /orders/:id(.:format)
                         orders#show
                             PUT    /orders/:id(.:format)
                         orders#update
                             DELETE /orders/:id(.:format)
                         orders#destroy

routes.rb

Bom::Application.routes.draw do

  resources :customers do
    resources :orders
  end
  
  resources :orders do
    resources :orderitems
  end
  
end