item groups now have order - start page is now item group 1 (configurable in globals)

back-office/app/models/item.rb

@@ -5,7 +5,7 @@ class Item < ActiveRecord::Base
   belongs_to :supplier
   belongs_to :brand
   belongs_to :delivery_time_estimation
-  has_and_belongs_to_many :item_groups,                                                       :join_table => 'item_item_groups'
+  
 
   validates_presence_of :name, :description, :list_price, :current_input_price, :tags, :unit_id, :code, :sub_category_id, :weight, :supplier_id
 

back-office/app/models/item_group.rb

@@ -1,5 +1,5 @@
 class ItemGroup < ActiveRecord::Base
-	has_and_belongs_to_many :items, :join_table => 'item_item_groups'
+
 
 
 end

back-office/app/models/item_in_group.rb

@@ -0,0 +1,8 @@
+class ItemInGroup < ActiveRecord::Base
+	belongs_to :item_group
+	belongs_to :item
+
+	validates_presence_of :item_group_id
+	validates_presence_of :item_id
+	validates_presence_of :position
+end