spec move functionality into factory

spec/factories/order.rb

@@ -2,12 +2,25 @@ require 'factory_girl'
 
 FactoryGirl.define do
 
-  # requires articles from single supplier, or supplier (with all its articles)
   factory :order do
     starts { Time.now }
+    supplier { FactoryGirl.create :supplier, article_count: (article_count.nil? ? true : article_count) }
+    article_ids { supplier.articles.map(&:id) unless supplier.nil? }
 
+    ignore do
+      article_count true
+    end
+
+    # for an order from stock; need to add articles
     factory :stock_order do
       supplier_id 0
+      # article_ids needs to be supplied
+    end
+
+    # In the order's after_save callback order articles are created, so
+    # until the order is saved, these articles do not yet exist.
+    after :create do |order|
+      order.reload
     end
   end