Show current stock value on stockit page.

app/models/stock_article.rb

@@ -48,6 +48,10 @@ class StockArticle < Article
     available
   end
 
+  def self.stock_value
+    available.collect { |a| a.quantity * a.gross_price }.sum
+  end
+
   protected
 
   def check_quantity

app/views/stockit/index.html.haml

@@ -53,4 +53,7 @@
               %td
                 = link_to icon(:edit), edit_stock_article_path(article)
                 = link_to icon(:delete), article, :method => :delete, :confirm => "Bist Du sicher?"
+    %p
+      Aktueller Lagerwert:
+      = number_to_currency StockArticle.stock_value