Fixed missing group_order_article in group_order show.

Also add eager loading for associated objects.

app/models/group_order_article.rb

@@ -166,7 +166,7 @@ class GroupOrderArticle < ActiveRecord::Base
   # Until the order is finished this will be the maximum price or
   # the minimum price depending on configuration. When the order is finished it
   # will be the value depending of the article results.
-  def total_price
+  def total_price(order_article = self.order_article)
     unless order_article.order.finished?
       if FoodsoftConfig[:tolerance_is_costly]
         order_article.article.fc_price * (quantity + tolerance)

app/models/order.rb

@@ -1,7 +1,6 @@
 # encoding: utf-8
 #
 class Order < ActiveRecord::Base
-  extend ActiveSupport::Memoizable    # Ability to cache method results. Use memoize :expensive_method
 
   # Associations
   has_many :order_articles, :dependent => :destroy
@@ -86,11 +85,11 @@ class Order < ActiveRecord::Base
   # The array has the following form:
   # e.g: [["drugs",[teethpaste, toiletpaper]], ["fruits" => [apple, banana, lemon]]]
   def articles_grouped_by_category
-    order_articles.includes(:article, :article_price).order('articles.name').
+    order_articles.includes([:article_price, :group_order_articles, :article => :article_category]).
+        order('articles.name').
         group_by { |a|  a.article.article_category.name }.
         sort { |a, b| a[0] <=> b[0] }
   end
-  memoize :articles_grouped_by_category
 
   def articles_sort_by_category
     order_articles.all(:include => [:article], :order => 'articles.name').sort do |a,b|