Ticket #12057: django1.0_cache_read_defaultcallable.patch

tests/regressiontests/cache/tests.py

@@ -180 +180 @@
         }
         self.cache.set("stuff", stuff)
         self.assertEqual(self.cache.get("stuff"), stuff)
+        
+    def test_model_instance(self):
+        from models import Poll, expensive_calculation
+        expensive_calculation.num_runs = 0
+        my_poll = Poll(question="Well?")
+        pub_date = my_poll.pub_date
+        self.cache.set('question', my_poll, 100)
+        cached_poll = self.cache.get('question')
+        self.assertEqual(cached_poll.pub_date, pub_date)  
+        # We only want the default expensive calculation run once    
+        self.assertEqual(expensive_calculation.num_runs, 1)
 
     def test_expiration(self):
         # Cache values can be set to expire

tests/regressiontests/cache/models.py

@@ +1 @@
+from django.db import models
+from datetime import datetime
+
+def expensive_calculation():
+    expensive_calculation.num_runs += 1
+    return datetime.now()    
+
+class Poll(models.Model):
+    question = models.CharField(max_length=200)
+    pub_date = models.DateTimeField('date published', default=expensive_calculation)