def test_reuse_foreign_value(self):
self.log.user_agent = "Mozilla"
self.log.save()
log2 = UserAccessLog(user_agent="Mozilla")
log2.save()
self.assertNotEqual(self.log.id, log2.id)
self.assertEqual(self.log.user_agent_fk_id, log2.user_agent_fk_id)
class TestForeignValue(TestCase):
def setUp(self):
self.log = UserAccessLog()
def test_set_foreign_value(self):
self.log.user_agent = "Mozilla"
self.assertEqual(self.log.user_agent_fk.value, "Mozilla")
self.assertIsNotNone(self.log.user_agent_fk_id)
def test_set_foreign_value_to_none(self):
self.log.user_agent = "Mozilla"
self.log.user_agent = None
self.assertEqual(self.log.user_agent_fk, None)
self.assertEqual(self.log.user_agent_fk_id, None)
def test_set_and_truncate_foreign_value(self):
self.log.user_agent = "*" * UserAgent.MAX_LENGTH * 2
self.assertEqual(self.log.user_agent_fk.value,
"*" * UserAgent.MAX_LENGTH)
def test_foreign_value_init(self):
log = UserAccessLog(user_agent="Mozilla")
self.assertEqual(log.user_agent_fk.value, "Mozilla")
def test_get_foreign_value_after_save(self):
self.log.user_agent = "Mozilla"
self.log.save()
log2 = UserAccessLog.objects.get(id=self.log.id)
self.assertIsNot(self.log, log2)
self.assertEqual(log2.user_agent, "Mozilla")
def test_reuse_foreign_value(self):
self.log.user_agent = "Mozilla"
self.log.save()
log2 = UserAccessLog(user_agent="Mozilla")
log2.save()
self.assertNotEqual(self.log.id, log2.id)
self.assertEqual(self.log.user_agent_fk_id, log2.user_agent_fk_id)
def test_lru_cache(self):
info = UserAccessLog.user_agent.get_related.cache_info()
self.assertEqual(info.misses, 0)
self.assertEqual(info.hits, 0)
self.log.user_agent = "Mozilla"
info = UserAccessLog.user_agent.get_related.cache_info()
self.assertEqual(info.misses, 1)
self.assertEqual(info.hits, 0)
log2 = UserAccessLog(user_agent="Mozilla")
info = UserAccessLog.user_agent.get_related.cache_info()
self.assertEqual(info.misses, 1)
self.assertEqual(info.hits, 1)
# matching instances indicates LRU cache was used
self.assertIs(self.log.user_agent_fk, log2.user_agent_fk)
def test_get_value(self):
self.log.user_agent = "Mozilla"
self.log.save()
UserAccessLog.user_agent.get_value.cache_clear()
info = UserAccessLog.user_agent.get_value.cache_info()
self.assertEqual(info.misses, 0)
self.assertEqual(info.hits, 0)
log = UserAccessLog.objects.get(id=self.log.id)
self.assertEqual(log.user_agent, "Mozilla")
info = UserAccessLog.user_agent.get_value.cache_info()
self.assertEqual(info.misses, 1)
self.assertEqual(info.hits, 0)
log = UserAccessLog.objects.get(id=self.log.id)
self.assertEqual(log.user_agent, "Mozilla")
info = UserAccessLog.user_agent.get_value.cache_info()
self.assertEqual(info.misses, 1)
self.assertEqual(info.hits, 1)
def test_foreign_value_duplicate(self):
ua1 = UserAgent(value="Mozilla")
ua2 = UserAgent(value="Mozilla")
ua1.save()
ua2.save()
self.assertNotEqual(ua1.id, ua2.id)
self.log.user_agent = "Mozilla"
self.log.save()
self.assertEqual(self.log.user_agent_fk.id, ua1.id)
def test_get_related_lru_cache_disabled(self):
with foreign_value_lru_cache_disabled("get_related"):
self.log.user_agent = "Mozilla"
log2 = UserAccessLog(user_agent="Mozilla")
self.assertEqual(self.log.user_agent_fk.id, log2.user_agent_fk.id)
# different instances indicates LRU cache was not used
self.assertIsNot(self.log.user_agent_fk, log2.user_agent_fk)
def test_get_value_lru_cache_disabled(self):
with foreign_value_lru_cache_disabled("get_value"):
self.log.user_agent = "Mozilla"
self.log.save()
log2 = UserAccessLog(user_agent="Mozilla")
with self.assertNumQueries(1):
self.assertEqual(log2.user_agent, "Mozilla")
# successive access to the save value hits the DB
log2 = UserAccessLog(user_agent="Mozilla")
with self.assertNumQueries(1):
self.assertEqual(log2.user_agent, "Mozilla")