menu, table,rooms, orders structure

db/migrate/20170402084230_create_menu_item_instances.rb

@@ -0,0 +1,14 @@
+class CreateMenuItemInstances < ActiveRecord::Migration[5.0]
+  def change
+    create_table :menu_item_instances do |t|
+      t.references :menu_item, :foreign_key => true, :null => false
+      t.string :item_instance_code, :null => false
+      t.json :attributes
+      t.decimal :price, :null => false
+      t.boolean :is_available, :null => false, :default => true
+      t.boolean :is_on_promotion, :null => false, :default => false
+      t.decimal :promotion_price, :null => false, :default => false
+      t.timestamps
+    end
+  end
+end