sale receipt generation and bill api

db/migrate/20170403140820_create_order_items.rb

@@ -7,9 +7,11 @@ class CreateOrderItems < ActiveRecord::Migration[5.0]
       t.string :item_code, :null => false
       t.string :item_name, :null => false
       t.decimal :qty, :precision => 10, :scale => 2, :null => false, :default => 0.00
+      t.decimal :price, :precision => 10, :scale => 2, :null => false, :default => 0.00
       t.string :remark
       t.string :options
       t.json :set_menu_items #this parameter is require to route the items correctly
+      t.boolean :taxable, :null => false, :default => true
       t.timestamps
     end
   end