mirror of
https://github.com/django/django.git
synced 2024-12-01 15:42:04 +01:00
59 lines
2.2 KiB
Python
59 lines
2.2 KiB
Python
import datetime
|
|
from unittest import mock
|
|
|
|
from django.db import connections
|
|
from django.db.models.sql.compiler import cursor_iter
|
|
from django.test import TestCase
|
|
|
|
from .models import Article
|
|
|
|
|
|
class QuerySetIteratorTests(TestCase):
|
|
itersize_index_in_mock_args = 3
|
|
|
|
@classmethod
|
|
def setUpTestData(cls):
|
|
Article.objects.create(name="Article 1", created=datetime.datetime.now())
|
|
Article.objects.create(name="Article 2", created=datetime.datetime.now())
|
|
|
|
def test_iterator_invalid_chunk_size(self):
|
|
for size in (0, -1):
|
|
with self.subTest(size=size):
|
|
with self.assertRaisesMessage(
|
|
ValueError, "Chunk size must be strictly positive."
|
|
):
|
|
Article.objects.iterator(chunk_size=size)
|
|
|
|
def test_default_iterator_chunk_size(self):
|
|
qs = Article.objects.iterator()
|
|
with mock.patch(
|
|
"django.db.models.sql.compiler.cursor_iter", side_effect=cursor_iter
|
|
) as cursor_iter_mock:
|
|
next(qs)
|
|
self.assertEqual(cursor_iter_mock.call_count, 1)
|
|
mock_args, _mock_kwargs = cursor_iter_mock.call_args
|
|
self.assertEqual(mock_args[self.itersize_index_in_mock_args], 2000)
|
|
|
|
def test_iterator_chunk_size(self):
|
|
batch_size = 3
|
|
qs = Article.objects.iterator(chunk_size=batch_size)
|
|
with mock.patch(
|
|
"django.db.models.sql.compiler.cursor_iter", side_effect=cursor_iter
|
|
) as cursor_iter_mock:
|
|
next(qs)
|
|
self.assertEqual(cursor_iter_mock.call_count, 1)
|
|
mock_args, _mock_kwargs = cursor_iter_mock.call_args
|
|
self.assertEqual(mock_args[self.itersize_index_in_mock_args], batch_size)
|
|
|
|
def test_no_chunked_reads(self):
|
|
"""
|
|
If the database backend doesn't support chunked reads, then the
|
|
result of SQLCompiler.execute_sql() is a list.
|
|
"""
|
|
qs = Article.objects.all()
|
|
compiler = qs.query.get_compiler(using=qs.db)
|
|
features = connections[qs.db].features
|
|
with mock.patch.object(features, "can_use_chunked_reads", False):
|
|
result = compiler.execute_sql(chunked_fetch=True)
|
|
self.assertIsInstance(result, list)
|