add out of stock

db/migrate/20191129043601_add_is_out_of_stock_to_menu_item_instaces.rb

@@ -0,0 +1,5 @@
+class AddIsOutOfStockToMenuItemInstaces < ActiveRecord::Migration[5.1]
+  def change
+    add_column :menu_item_instances, :is_out_of_stock, :boolean
+  end
+end

db/migrate/20191204091822_create_out_of_stocks.rb

@@ -0,0 +1,10 @@
+class CreateOutOfStocks < ActiveRecord::Migration[5.1]
+  def change
+    create_table :out_of_stocks do |t|
+      t.datetime :date
+      t.string :item_instance_code
+
+      t.timestamps
+    end
+  end
+end