update model for menu

app/models/item_set.rb

@@ -1,2 +1,7 @@
 class ItemSet < ApplicationRecord
+	has_many :menu_item_sets
+	has_many :menu_items, through: :menu_item_sets
+
+	has_many :menu_instance_item_sets
+	has_many :menu_item_instances, through: :menu_item_sets
 end

app/models/menu_instance_item_set.rb

@@ -1,2 +1,4 @@
 class MenuInstanceItemSet < ApplicationRecord
+	belongs_to :item_set
+	belongs_to :menu_item_instance
 end

app/models/menu_item.rb

@@ -8,6 +8,9 @@ class MenuItem < ApplicationRecord
   has_many :children, :class_name => "MenuItem", foreign_key: "menu_item_id"
   belongs_to :account
 
+  has_many :menu_item_sets
+  has_many :item_sets, through: :menu_item_sets
+
   validates_presence_of :name, :type, :min_qty, :taxable, :min_selectable_item, :max_selectable_item
 
   default_scope { order('item_code asc') }

app/models/menu_item_set.rb

@@ -1,2 +1,4 @@
 class MenuItemSet < ApplicationRecord
+	belongs_to :item_set
+	belongs_to :menu_item
 end