bug fix: make sure order item quantity changes are perstisten

git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@3297 fd906abe-77d9-0310-91a1-e0d9ade77398

commerce/order.py

@@ -78,7 +78,7 @@ class OrderItem(Track):
         self.getParent().context.removeTrack(self)
 
     def modify(self, quantity, **kw):
-        self.data['quantity'] = quantity
+        self.update(dict(quantity=quantity))
         return self
 
     def setOrder(self, order):

tracking/btree.py

@@ -86,7 +86,7 @@ class Track(Persistent):
         self.timeStamp = getTimeStamp()
         data = self.data
         data.update(newData)
-        self.data = data
+        self.data = data    # record change
 
     def __repr__(self):
         md = self.metadata