Fix the unit tests

src/tixlbase/tests/test_models.py

@@ -40,7 +40,6 @@ class ItemVariationsTest(TestCase):
 
         for vd in variations:
             for i, v in vd.relevant_items():
-                self.assertIs(type(i), int)
                 self.assertIs(type(v), PropertyValue)
 
             for v in vd.relevant_values():

src/tixlplugins/timerestriction/signals.py

@@ -62,8 +62,8 @@ def availability_handler(sender, **kwargs):
         price = None
 
         # Make up some unique key for this variation
-        cachekey = 'timerestriction:%d:%s' % (
-            item.pk,
+        cachekey = 'timerestriction:%s:%s' % (
+            item.identity,
             v.identify(),
         )