Order refactoring part two: Balancing workflow was adapted to the new order schema. Article modification is still missing.

app/models/order_article.rb

@@ -24,19 +24,39 @@ class OrderArticle < ActiveRecord::Base
   validates_presence_of :order_id
   validates_presence_of :article_id
   validates_uniqueness_of :article_id, :scope => :order_id   #  an article can only have one record per order
+  validate :article_and_price_exist
 
   named_scope :ordered, :conditions => "units_to_order >= 1"
 
+  # TODO: How to create/update articles/article_prices during balancing
+#  # Accessors for easy create of new order_articles in balancing process
+#  attr_accessor :name, :order_number, :units_to_order, :unit_quantity, :unit, :net_price, :tax, :deposit
+#
+#  before_validation_on_create :create_new_article
+
   # This method returns either the Article or the ArticlePrice
   # The latter will be set, when the the order is finished
   def price
     article_price || article
   end
   
+  # Count quantities of belonging group_orders. 
+  # In balancing this can differ from ordered (by supplier) quantity for this article.
+  def group_orders_sum
+    quantity = group_order_articles.collect(&:quantity).sum
+    {:quantity => quantity, :price => quantity * price.fc_price}
+  end
+
   private
   
-    def validate
-       errors.add(:article, "muss angegeben sein und einen aktuellen Preis haben") if !(article = Article.find(article_id)) || article.fc_price.nil?
-    end
-    
+  def article_and_price_exist
+     errors.add(:article, "muss angegeben sein und einen aktuellen Preis haben") if !(article = Article.find(article_id)) || article.fc_price.nil?
+  end
+
+#  def create_new_article
+#    old_article = order.articles.find_by_name(name) # Check if there is already an Article with this name
+#    unless old_article
+#      self.article.build
+#    end
+#  end
 end