test_querysetsequence.py 文件源码

def test_iter_cache(self):
        """Ensure that iterating the QuerySet caches."""
        qss = self.all._clone()

        with self.assertNumQueries(2):
            data = [it.title for it in qss]
            self.assertEqual(data, TestIterator.EXPECTED)

        # So the second call does nothing.
        with self.assertNumQueries(0):
            data = [it.title for it in qss]
            self.assertEqual(data, TestIterator.EXPECTED)