Fix order bug

app/controllers/orders_controller.rb

@@ -45,7 +45,7 @@ class OrdersController < ApplicationController
   def quickpay
     user = User.find(params[:user_id])
     order = user.orders.build
-    order.products << user.dagschotel
+    order.order_items << OrderItem.new(count: 1, product: user.dagschotel, order: order)
     if order.save
       flash[:success] = "Quick pay succeeded. #{view_context.link_to("Undo", [user, order], method: :delete)}."
     else

db/migrate/20150209144839_not_null_fields.rb

@@ -1,6 +1,9 @@
 class NotNullFields < ActiveRecord::Migration
-  def change
+  def up
     change_column :order_items, :product_id, :integer, null: false
-    change_column :order_items, :order_id, :integer, null: false
+  end
+
+  def down
+    change_column :order_items, :product_id, :integer, null: true
   end
 end

db/migrate/20150209145303_products_name_presence_true.rb

@@ -1,5 +1,9 @@
 class ProductsNamePresenceTrue < ActiveRecord::Migration
-  def change
+  def up
     change_column :products, :name, :string, null: false
   end
+
+  def down
+    change_column :products, :name, :string, null: true
+  end
 end

db/migrate/20150210062809_order_id_null_allowed_in_order_items.rb

@@ -0,0 +1,9 @@
+class OrderIdNullAllowedInOrderItems < ActiveRecord::Migration
+  def up
+    change_column :order_items, :order_id, :integer, null: true
+  end
+
+  def down
+    change_column :order_items, :order_id, :integer, null: false
+  end
+end

db/schema.rb

@@ -11,10 +11,10 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150209145303) do
+ActiveRecord::Schema.define(version: 20150210062809) do
 
   create_table "order_items", force: true do |t|
-    t.integer "order_id",               null: false
+    t.integer "order_id"
     t.integer "product_id",             null: false
     t.integer "count",      default: 0
   end